The Appendix is intended for use in conjunction with the 2017 Annual Air Quality in Ontario Report. The Appendix briefly describes the provincial Air Quality Health Index (AQHI) network, quality assurance and quality control procedures, and the Ministry of the Environment, Conservation and Parks’ air quality database. It also includes a series of tables displaying station locations and a listing of the summary statistics including means, maximums, percentile values and the number of exceedances of the Ontario Ambient Air Quality Criteria (AAQC) for each pollutant. In addition, trends for select pollutants are displayed for a 10-year period.

Monitoring network operations

Network description

In 2017, the Ministry operated 39 ambient air monitoring sites across Ontario as part of the AQHI network. Monitoring site locations for the AQHI network are illustrated in Map A1. The AQHI network was comprised of 133 continuous monitoring instruments at 39 sites. These instruments have the capability of recording minute data (approximately 70 million data points per year) that are used to scan and validate the continuous hourly data.

Quality assurance and quality control

Day-to-day maintenance and support of the instruments are administered by Ministry staff. Instrumentation precision is verified by daily automatic internal zero and span checks. Data analysts and station operators review span control charts to confirm instrument precision using a telemetry system. A quarterly quality assurance and quality control (QA/QC) review is performed on the ambient data set to highlight anomalies and administer corrective action in a timely manner.

The air monitoring station operators routinely inspect and maintain monitoring equipment and stations with mandatory quarterly on-site visits where secondary transfer standards are used to calibrate instrumentation. Station maintenance activities are recorded using FieldWorker Inc. software, an electronic documentation solution; this information is transferred directly to the Ministry’s database. The instrumentation used throughout the provincial air monitoring network has been standardized to Thermo Electron Corporation analyzers to streamline parts inventory and leverage common hardware used within each analyzer. The following is a summary of the instrumentation deployed within the network and are all US EPA designated equivalent methods:

  • Nitrogen Oxides – TE42C/I
  • Fine Particulate Matter – SHARP 5030
  • Ozone – TE49C/I
  • Sulphur Dioxide – TE43I
  • Carbon Monoxide – TE48I
  • Total Reduced Sulphur – TE43I/CDN101

The Ministry operates a laboratory with gas reference standards that adhere to those of the U.S. National Institute of Standards and Technology (NIST) and the Air Quality Research Division of Environment and Climate Change Canada. The secondary transfer standards used by station operators are referenced and certified to the Ministry’s NIST primary standards on a quarterly basis.

The Ontario ambient air quality monitoring network undergoes constant maintenance to ensure a high standard of quality control. Continuous real-time data are consistently reviewed, assessed and validated by Ministry staff. Immediate actions are taken to correct any inconsistencies that may affect the validity of the data. These measures ensure ambient air monitoring data are valid, complete, comparable, representative and accurate. As a result, the 2017 ambient air quality monitoring network had greater than 99% valid data from over one million hourly data points.

Data base

The ambient air quality data used in this report are stored in the Ministry’s air quality information system (AQUIS) and are made available through the Air Quality Ontario web site, and the Ministry’s Open Data Catalogue. A statistical pattern test is used to identify data anomalies, such as unusual pollutant concentrations. Each pollutant has a predetermined concentration range based on historical data. Values outside this range are flagged for further investigation.

Data are obtained from automated ambient air monitoring instruments that operate continuously to produce an average measurement for every hour for a possible total of 8,760 measurements in a given year. Hourly parameters measured include NO/NO2/NOx, PM2.5, O3, SO2, CO and TRS compounds. An annual mean requires at least 6,570 hourly readings. In addition, each quarter of the year should have 75% valid data for PM2.5, whereas for ozone, only the 2nd and 3rd quarters of the year require 75% valid data based on protocols that are consistent with the Canadian Council of Ministers of the Environment (CCME) and the United States Environmental Protection Agency (U.S. EPA). An annual or monthly mean for 24-hour VOC samples requires 50% of valid samples.

Network descriptive table

The AQHI network for 2017 is summarized in Table A1. The table displays the station name, numerical identifier and pollutants measured. The numerical identifier is the station (ID) number, the first digit of which identifies the geographic region in which the station is located. Air monitoring stations within the AQHI network can measure up to six common pollutants (NO2, PM2.5, ozone, SO2, CO and TRS compounds) based on the pollutant(s) of concern for the regional area it represents.

Table A1 also identifies the type of air monitoring site: ambient, road-side, Canadian Ambient Air Quality Standard (CAAQS), and/or National Air Pollution Surveillance (NAPS). Ambient sites represent the general air quality of an area without any direct influence of local industrial sources. Road-side sites are within approximately 100 m of a major roadway with daily traffic volumes greater than 10,000 vehicles per day.

Annual statistics and 10-year trends

The 2017 statistical data and 10-year trends for various continuous pollutants are provided in Tables A2-A9, and Tables A10-A18, respectively. The annual averages, maximums and percentiles are displayed in the annual statistics tables. (A percentile is the value equal to or below which a given percentage of the data set falls. For example, if 70% of the data are equal to or below 0.10 ppm, the 70th percentile is 0.10 ppm).

The 10-year trends are calculated from monthly means through the Mann-Kendall (M-K) test. The M-K test is a nonparametric statistical approach that can be applied to data without making assumptions on the nature of the data distribution. The M-K test is essentially a test for uniform progression (zero change) in the slope of the linear regression of time-ordered data versus time (Gilbert, 1987). The M-K test is particularly suitable for environmental monitoring data since missing, trace and below detection limit values can be handled. This test can also be used to compare trends at multiple stations. The seasonal Kendall test, also performed in this Report, is a generalization of the M-K test (Gilbert, 1987) for use to determine the true trend when there are seasonal cycles in the data which do not constitute a true long-term trend. The 10-year change over time was based on the Sen’s slope, also known as the Thiel-Sen’s estimator of linear trend. The Sen’s slope is closely-related to and applied in conjunction with the M-K Test. Compared to the common least squares regression, the Sen’s slope procedure is a nonparametric method for computing the value of the true slope when there are gross errors or outliers in the data without making assumptions of a normal distribution on the data (Gilbert, 1987).

Other informative tables

Calculated CAAQS metrics for PM2.5 and ozone are presented for 2017 (based on a three-year average, 2015-2017) in Table A19. The percentage distribution of hourly AQHI readings within the various health risk categories for each of the 39 monitoring sites are displayed in Table A20. Table A21 summarizes the number of air quality alerts issued in Ontario during 2017. The 2017 statistical and 10-year trends for selected toxics are provided in Tables A22-A27, and Tables A28-A33, respectively.

Map A1: Air Quality Health Index (AQHI) monitoring sites across Ontario in 2017

Map depicting the Air Quality Health Index monitoring sites across Ontario in 2017

AQHI stations: Rural (6), Urban (33)

Tables

Table A1: 2017 Ontario continuous ambient air monitoring network

IDStation nameStation locationYearLatitudeLongitudeAir intakeTypeAQHINO2PM2.5O3SO2COTRS
12008Windsor Downtown467 University Ave. W.196942°18'56.8"-83°02'37.2"8A/RS/C/NYTTTTTn/a
12016Windsor WestCollege Ave./South St.197542°17'34.4"-83°04'23.3"4A/NYTTTTn/aT
13001Chatham435 Grand Ave. W.200542°24'13.3"-82°12'29.9"15A/C/NYTTTn/an/an/a
14111Sarnia700 Christina St. N.201642°59’25.0”-82°23’43.2"3A/C/NYTTTTn/aT
15020Grand BendPoint Blake Conservation Area199143°19'59.1"-81°44'34.4"5A/NYTTTn/an/an/a
15026London42 St. Julien St.201342°58'28.1"-81°12'03.1"5A/C/NYTTTn/an/an/a
16015Port Stanley43665 Dexter Line, Elgin Water T. Plant200242°40'19.5"-81°09'46.4"5A/NYTTTn/an/an/a
18007Tiverton4th Concession/Bruce Rd. 23197944°18'52.1"-81°32'59.0"4A/NYn/aTTn/an/an/a
21005Brantford324 Grand River Ave.200443°08'19.0"-80°17'33.5"5A/C/NYTTTn/an/an/a
26060KitchenerWest Ave./Homewood Ave.199043°26'37.8"-80°30'13.7"5A/C/NYTTTn/an/an/a
27067St. CatharinesArgyle Cres., Pump Stn.198743°09'36.2"-79°14'05.1"4A/C/NYTTTn/an/an/a
28028GuelphExhibition St./Clark St. W.200043°33'05.8"-80°15'51.0"4A/C/NYTTTn/an/an/a
29000Hamilton DowntownElgin St./Kelly St.198743°15'28.0"-79°51'42.0"4A/RS/C/NYTTTTTT
29114Hamilton MountainVickers Rd./E. 18th St.198543°13'45.9"-79°51'46.0"3A/C/NYTTTTn/an/a
29118Hamilton WestMain St. W./Hwy 403198543°15'26.8"-79°54'27.9"3A/RS/NYTTTn/an/an/a
31103Toronto DowntownBay St./Wellesley St. W.200043°39'46.7"-79°23'17.2"10A/RS/C/NYTTTn/an/an/a
33003Toronto EastKennedy rd./lawrence Ave. E.197043°44'52.5"-79°16'26.6"4A/RS/C/NYTTTn/an/an/a
34021Toronto North4905 Dufferin St.198843°46'53.8"-79°25'03.8"5A/RS/C/NYTTTTTn/a
35125Toronto West125 Resources Rd.200343°42'34.0"-79°32'36.6"8A/RS/C/NYTTTTTn/a
44008BurlingtonNorth Shore Blvd. E./Lakeshore Rd.197943°18'54.4"-79°48'09.5"5A/C/NYTTTn/an/an/a
44017OakvilleEighth Line/Glenashton Dr., Halton Reservoir200343°29'12.9"-79°42'08.2"12A/C/NYTTTn/an/an/a
45026Oshawa2000 Simcoe St. N., Durham College200543°56'45.4"-78°53'41.7"7A/RS/C/NYTTTn/an/an/a
46090Brampton109 McLaughlin Rd. S.200043°41'55.5"-79°46'51.3"5A/C/NYTTTn/an/an/a
46108Mississauga3359 Mississauga Rd. N., U of T Mississauga200743°32'49.1"-79°39'31.3"5A/C/NYTTTn/an/an/a
47045Barrie83 Perry St.200144°22'56.5"-79°42'08.3"5A/C/NYTTTn/an/an/a
48006NewmarketEagle St. W./McCaffrey Rd.200144°02'39.5"-79°28'59.7"5A/NYTTTn/an/an/a
49005Parry Sound7 Bay St.200145°20'16.3"-80°02'17.4"5A/NYTTTn/an/an/a
49010Dorset1026 Bellwood acres RD.198145°13'27.4"-78°55'58.6"3A/NYn/aTTn/an/an/a
51001Ottawa DowntownRideau St./Wurtemburg St.197145°26'03.6"-75°40'33.6"4A/C/NYTTTTTn/a
51002Ottawa Central960 Carling Ave.200745°22'57.1"-75°42'51.1"5A/NYTTTn/an/an/a
51010PetawawaPetawawa Research Forest Facility200745°59'48.2"-77°26'28.3"6A/NYn/aTTn/an/an/a
52023Kingston23 Beechgrove Lane201444°13'11.5"-76°31'16.1"5A/C/NYTTTn/an/an/a
54012Belleville2 Sidney St., Water Treatment Plant200244°09'01.9"-77°23'43.8"10A/NYTTTn/an/an/a
56051CornwallBedford St./3rd St. W.197045°01'04.7"-74°44'06.8"4A/NYTTTn/an/an/a
59006Peterborough10 Hospital Dr.199844°18'06.9"-78°20'46.4"10A/C/NYTTTn/an/an/a
63203Thunder Bay421 James St. S.200448°22'45.8"-89°17'24.6"15A/RS/C/NYTTTn/an/an/a
71078Sault Ste. MarieSault College200446°31'59.5"-84°18'35.7"8A/C/NYTTTTn/aT
75010North BayChippewa St. W., Dept. National Defence197946°19'23.5"-79°26'57.4"4A/RS/NYTTTn/an/an/a
77233Sudbury155 Elm St.201346°29'31.0"-81°00'11.2"3A/C/NYTTTTn/an/a
Total       393639391054

Notes:

ID
station identfication number
Year
year station began monitoring
Air intake
height of air intake above ground (m)
Type
type of monitoring site: A = ambient, RS = road-side, C = CAAQS, N = NAPS
AQHI
Air Quality Health Index site
T
telemetry
NO2
nitrogen dioxide
PM2.5
fine particulate matter
O3
ground-level ozone
SO2
sulphur dioxide
CO
carbon monoxide
TRS
total reduced sulphur
Y
yes

Table A2: 2017 nitric oxide (NO) annual statistics

Unit: parts per billion (ppb)

IDCityLocationValid h10%30%50%70%90%99%MeanMax 1hMax 24h
12008Windsor Downtown467 University Ave. W.864701137333.312421
12016Windsor WestCollege Ave./South St.873500125322.616441
13001Chatham435 Grand Ave. W.867800125181.97114
14111Sarnia700 Christina St. N.866701113141.57412
15020Grand BendPoint Blake Conservation Area86490001120.371
15026London42 St. Julien St.8690000121617714
16015Port Stanley43665 Dexter Line, Elgin Water T. Plant86860000120.2262
21005Brantford324 Grand River Ave.864800002130.86311
26060KitchenerWest Ave./Homewood Ave.8679000121919125
27067St. CatharinesArgyle Cres., Pump Stn.870500012221.26815
28028GuelphExhibition St./Clark St. W.868200002211.18029
29000Hamilton DowntownElgin St./Kelly St.871200139503.922849
29114Hamilton MountainVickers Rd./E. 18th St.868300013151.28513
29118Hamilton WestMain St. W./Hwy 403868500139453.915649
31103Toronto DowntownBay St./Wellesley St. W.867801126252.78330
33003Toronto EastKennedy Rd./Lawrence Ave. E.869101249434.414934
34021Toronto North4905 Dufferin St.87050012643315438
35125Toronto West125 Resources Rd.8693013618827.715362
44008BurlingtonNorth Shore Blvd. E./Lakeshore Rd.870901127433.413537
44017OakvilleEighth Line/Glenashton Dr., Halton Res.866600113221.78527
45026Oshawa2000 Simcoe St. N., Durham College865401125202.48827
46090Brampton109 McLaughlin Rd. S.873200014402.215935
46108Mississauga3359 Mississauga Rd. N., U of T Campus86980001440211532
47045Barrie83 Perry St.866001124362.614834
48006NewmarketEagle St. W./McCaffrey Rd.869000113161.46412
49005Parry Sound7 Bay St.86860001170.5234
51001Ottawa DowntownRideau St./Wurtemburg St.865800113161.59520
51002Ottawa Central960 Carling Ave.870000113271.713922
52023Kingston23 Beechgrove Lane86500000170.6498
54012Belleville2 Sidney St., Water Treatment Plant864300013141.17520
56051CornwallBedford St./3rd St. W.866600012171.212719
59006Peterborough10 Hospital Dr.868800112121.25816
63203Thunder Bay421 James St. S.8642011310384.114330
71078Sault Ste. MarieSault College869100113111.3547
75010North BayChippewa St. W., Dept. National Defence874801113171.66219
77233Sudbury155 Elm St.864401125332.513035

Table A3: 2017 nitrogen dioxide (NO2) annual statistics

Unit: parts per billion (ppb)

NO2 1h AAQC: 200 ppb

NO2 24h AAQC: 100 ppb

IDCityLocationValid h10%30%50%70%90%99%MeanMax 1hMax 24hNumber of times above 1h criterionNumber of times above 24h criterion
12008Windsor Downtown467 University Ave. W.864746913213511.1532900
12016Windsor WestCollege Ave./South St.87353581219339.9482600
13001Chatham435 Grand Ave. W.8678345711216.1411900
14111Sarnia700 Christina St. N.8667236916277.3442300
15020Grand BendPoint Blake Conservation Area864912346103191100
15026London42 St. Julien St.8690234611235.8401900
16015Port Stanley43665 Dexter Line, Elgin Water T. Plant868612235102.723800
21005Brantford324 Grand River Ave.8648123510204.4371800
26060KitchenerWest Ave./Homewood Ave.8664234612255.8401900
27067St. CatharinesArgyle Cres., Pump Stn.8703235714276.6402400
28028GuelphExhibition St./Clark St. W.8682134712275.9392300
29000Hamilton DowntownElgin St./Kelly St.8712461014243711.9603200
29114Hamilton MountainVickers Rd./E. 18th St.8683246917307.8412200
29118Hamilton WestMain St. W./Hwy 403868535812223510.4453100
31103Toronto DowntownBay St./Wellesley St. W.8678581115243813503400
33003Toronto EastKennedy Rd./Lawrence Ave. E.869136913233911.5553400
34021Toronto North4905 Dufferin St.870535813223810.5493600
35125Toronto West125 Resources Rd.8693591318284315554100
44008BurlingtonNorth Shore Blvd. E./Lakeshore Rd.86402581121359.7493100
44017OakvilleEighth Line/Glenashton Dr., Halton Res.8666246918338.2563800
45026Oshawa2000 Simcoe St. N., Durham College8654235713296.4413100
46090Brampton109 McLaughlin Rd. S.87321351020378.3503100
46108Mississauga3359 Mississauga Rd. N., U of T Campus8698246917328503500
47045Barrie83 Perry St.8661235816347.3643400
48006NewmarketEagle St. W./McCaffrey Rd.8690234714306.3422600
49005Parry Sound7 Bay St.868611236162.7351400
51001Ottawa DowntownRideau St./Wurtemburg St.8658235815337.1562400
51002Ottawa Central960 Carling Ave.8700123511345.2472500
52023Kingston23 Beechgrove Lane865012359224.4482300
54012Belleville2 Sidney St., Water Treatment Plant864312349234.3351700
56051CornwallBedford St./3rd St. W.8666123511305542700
59006Peterborough10 Hospital Dr.8688123510264.7412700
63203Thunder Bay421 James St. S.8642235714306.7513000
71078Sault Ste. MarieSault College869112359214.4442000
75010North BayChippewa St. W., Dept. National Defence8748123410314.6422500
77233Sudbury155 Elm St.8644234715436.8583300

Table A4: 2017 nitrogen oxides (NOx) annual statistics

Unit: parts per billion (ppb)

IDCityLocationValid h10%30%50%70%90%99%MeanMax 1hMax 24h
12008Windsor Downtown467 University Ave. W.8647581115276714.416349
12016Windsor WestCollege Ave./South St.873546913246312.520168
13001Chatham435 Grand Ave. W.867834691535810731
14111Sarnia700 Christina St. N.86672461018388.710133
15020Grand BendPoint Blake Conservation Area864912346113.42011
15026London42 St. Julien St.8690235713356.89331
16015Port Stanley43665 Dexter Line, Elgin Water T. Plant868612235113479
21005Brantford324 Grand River Ave.8648123612295.38423
26060KitchenerWest Ave./Homewood Ave.8664234714416.912442
27067St. CatharinesArgyle Cres., Pump Stn.8703245816447.99436
28028GuelphExhibition St./Clark St. W.86821347144579846
29000Hamilton DowntownElgin St./Kelly St.8712471117318215.827676
29114Hamilton MountainVickers Rd./E. 18th St.86832461019429.112035
29118Hamilton WestMain St. W./Hwy 403868536915327314.219072
31103Toronto DowntownBay St./Wellesley St. W.8696691217305915.712263
33003Toronto EastKennedy Rd./Lawrence Ave. E.8691481217327815.818966
34021Toronto North4905 Dufferin St.870536914287213.519166
35125Toronto West125 Resources Rd.869361116254611422.720397
44008BurlingtonNorth Shore Blvd. E./Lakeshore Rd.864036914287213.217362
44017OakvilleEighth Line/Glenashton Dr., Halton Res.86663461021529.913565
45026Oshawa2000 Simcoe St. N., Durham College8654246918478.812857
46090Brampton109 Mclaughlin Rd. S.873223611247110.619564
46108Mississauga3359 Mississauga Rd. N., U of T Campus86982461022659.913656
47045Barrie83 Perry St.8661346920649.921268
48006NewmarketEagle St. W./McCaffrey Rd.8690235816417.89238
49005Parry Sound7 Bay St.868611237203.35316
51001Ottawa DowntownRideau St./Wurtemburg St.8658246917478.613232
51002Ottawa Central960 Carling Ave.870023461457718541
52023Kingston23 Beechgrove Lane8650123510284.99832
54012Belleville2 Sidney St., Water Treatment Plant8643123512355.410232
56051CornwallBedford St./3rd St. W.8666223513456.217234
59006Peterborough10 Hospital Dr.8688234611355.89143
63203Thunder Bay421 James St. S.864234711246310.819460
71078Sault Ste. MarieSault College8691234612295.88527
75010North BayChippewa St. W., Dept. National Defence8748123613466.210244
77233Sudbury155 Elm St.8644245919689.418861

Table A5: 2017 fine particulate matter (PM2.5) annual statistics

Unit: micrograms per cubic metre (μg/m3)

PM2.5 24h reference level: 28 μg/m3

IDCityLocationValid h10%30%50%70%90%99%MeanMax 1hMax 24hNo. of times above 24h reference level
12008Windsor Downtown467 University Ave. W.8705356915267.844301
12016Windsor WestCollege Ave./South St.86393571016298.548321
13001Chatham435 Grand Ave. W.8667135813226.434210
14111Sarnia700 Christina St. N.870423691527759321
15020Grand BendPoint Blake Conservation Area8675234610185.130230
15026London42 St. Julien St.870324681325739250
16015Port Stanley43665 Dexter Line, Elgin Water T. Plant8640235812236.334220
18007Tiverton4th Concession/Bruce Rd. 238457224611205.139190
21005Brantford324 Grand River Ave.8671246914247.255200
26060KitchenerWest Ave./Homewood Ave.862213581428742230
27067St. CatharinesArgyle Cres., Pump Stn.850924681325751280
28028GuelphExhibition St./Clark St. W.8694235814236.837240
29000Hamilton DowntownElgin St./Kelly St.86732471117288.547270
29114Hamilton MountainVickers Rd./E. 18th St.8727246914277.451250
29118Hamilton WestMain St. W./Hwy 4038674246915267.548250
31103Toronto DowntownBay St./Wellesley St. W.8644246914267.482280
33003Toronto EastKennedy Rd./Lawrence Ave. E.8716246914257.440270
34021Toronto North4905 Dufferin St.8726246915267.458270
35125Toronto West125 Resources Rd.8713246914267.447250
44008BurlingtonNorth Shore Blvd. E./Lakeshore Rd.873224681424757381
44017OakvilleEighth Line/Glenashton Dr., Halton Res.8687235814256.940240
45026Oshawa2000 Simcoe St. N., Durham College8697135712225.949230
46090Brampton109 McLaughlin Rd. S.873224681326755250
46108Mississauga3359 Mississauga Rd. N., U of T Campus8711136914256.844250
47045Barrie83 Perry St.851213591528760321
48006NewmarketEagle St. W./McCaffrey Rd.8745135713235.943220
49005Parry Sound7 Bay St.8734123510194.637200
49010Dorset1026 Bellwood Acres Rd.853112469164.629180
51001Ottawa DowntownRideau St./Wurtemburg St.8727235711215.942280
51002Ottawa Central960 Carling Ave.8723235711225.869270
51010PetawawaPetawawa Research Forest Facility847112358144.123140
52023Kingston23 Beechgrove Lane8616134611185.338190
54012Belleville2 Sidney St., Water Treatment Plant8614234712205.839200
56051CornwallBedford St./3rd St. W.8486135712245.947260
59006Peterborough10 Hospital Dr.8726134712235.844220
63203Thunder Bay421 James St. S.8644134610205.134220
71078Sault Ste. MarieSault College871823461018533160
75010North BayChippewa St. W., Dept. National Defence872123459154.631130
77233Sudbury155 Elm St.833513461019539150

Note:

Measurements taken by SHARP 5030.

The PM2.5 24-hour reference level of 28 µg/m3 is based on the 24-hour PM2.5 Canadian Ambient Air Quality Standard (CAAQS) established in 2015.

Table A6: 2017 ozone (O3) annual statistics

Unit: parts per billion (ppb)
O3 1h AAQC: 80 ppb

IDCityLocationValid h10%30%50%70%90%99%MeanMax 1hMax 24hNo. of times above 1h criterion
12008Windsor Downtown467 University Ave. W.86569202734456327.378510
12016Windsor WestCollege Ave./South St.8708919273445632782521
13001Chatham435 Grand Ave. W.867915232935446129.590572
14111Sarnia700 Christina St. N.867613222834436128.480540
15020Grand BendPoint Blake Conservation Area86791725313644623182594
15026London42 St. Julien St.86869222935446228.178580
16015Port Stanley43665 Dexter Line, Elgin Water T. Plant86851827333848663390633
18007Tiverton4th Concession/Bruce Rd. 23854919273338446132.482631
21005Brantford324 Grand River Ave.86509222935446228.374600
26060KitchenerWest Ave./Homewood Ave.856112222934436028.175580
27067St. CatharinesArgyle Cres., Pump Stn.871411222934435928.173570
28028GuelphExhibition St./Clark St. W.868010222935446128.476600
29000Hamilton DowntownElgin St./Kelly St.87128192632415925.673590
29114Hamilton MountainVickers Rd./E. 18th St.869014232935446029.181571
29118Hamilton WestMain St. W./Hwy 4038679518263241602574610
31103Toronto DowntownBay St./Wellesley St. W.869410192631405725.685582
33003Toronto EastKennedy Rd./Lawrence Ave. E.86917182531395724.482571
34021Toronto North4905 Dufferin St.8717617243040592482591
35125Toronto West125 Resources Rd.86754142229395722.182592
44008BurlingtonNorth Shore Blvd. E./Lakeshore Rd.87089212834435927.188614
44017OakvilleEighth Line/Glenashton Dr., Halton Res.866612212833425927.484601
45026Oshawa2000 Simcoe St. N., Durham College866411222834426327.986603
46090Brampton109 McLaughlin Rd. S.87339212834426027.275600
46108Mississauga3359 Mississauga Rd. N., U of T Campus87006192733425926.278620
47045Barrie83 Perry St.86409202733405425.975530
48006NewmarketEagle St. W./McCaffrey Rd.869112222834425827.985582
49005Parry Sound7 Bay St.868815253035425629.774630
49010Dorset1026 Bellwood Acres Rd.86198212834425426.969520
51001Ottawa DowntownRideau St./Wurtemburg St.868312202631395325.571570
51002Ottawa Central960 Carling Ave.869511212732405426.276570
51010PetawawaPetawawa Research Forest Facility873810202732405125.865570
52023Kingston23 Beechgrove Lane865016253036446030.494623
54012Belleville2 Sidney St., Water Treatment Plant870114243036456230.286634
56051CornwallBedford St./3rd St. W.866612222833415627.272630
59006Peterborough10 Hospital Dr.868514232935435928.980600
63203Thunder Bay421 James St. S.86356182530374523.451440
71078Sault Ste. MarieSault College870515232933405028.170460
75010North BayChippewa St. W., Dept. National Defence874910212732405226.469560
77233Sudbury155 Elm St.868312212632394925.969500

Table A7: 2017 sulphur dioxide (SO2) annual statistics

Unit: parts per billion (ppb)

SO2 1h AAQC: 250 ppb

SO2 24h AAQC: 100 ppb

SO2 1y AAQC: 20 ppb

IDCityLocationValid h10%30%50%70%90%99%MeanMax 1hMax 24hNo. of times above 1h criterionNo. of times above 24h criterionNo. of times above annual criterion
12008Windsor Downtown467 University Ave. W.868300013121337000
12016Windsor WestCollege Ave./South St.87350001290.9289000
14111Sarnia700 Christina St. N.874800004301.77226000
29000Hamilton DowntownElgin St./Kelly St.8707001210413.58623000
29114Hamilton MountainVickers Rd./E. 18th St.869000015211.87318000
34021Toronto North4905 Dufferin St.87280000020.182000
35125Toronto West125 Resources Rd.86860001130.5113000
51001Ottawa DowntownRideau St./Wurtemburg St.86700000010.131000
71078Sault Ste. MarieSault College869300001130.7439000
77233Sudbury155 Elm St.869100003231.311914000

Note:

The 2017 SO2 measurements are compared to the SO2 AAQC that was in effect in 2017. The province updated the SO2 1h AAQC (40 ppb) and annual AAQC (4 ppb) in 2018.

Table A8: 2017 carbon monoxide (CO) annual statistics

Unit: parts per million (ppm)

CO 1h AAQC: 30 ppm

CO 8h AAQC: 13 ppm

IDCityLocationValid h10%30%50%70%90%99%MeanMax 1hMax 8hNo. of times above 1h criterionNo. of times above 8h criterion
12008Windsor Downtown467 University Ave. W.86610000010.22.580.8600
29000Hamilton DowntownElgin St./Kelly St.86560000010.22.130.7500
34021Toronto North4905 Dufferin St.83810000010.210.7300
35125Toronto West125 Resources Rd.83450000010.21.230.8600
51001Ottawa DowntownRideau St./Wurtemburg St.69710000000.20.670.4800

Table A9: 2017 total reduced sulphur (TRS) compounds annual statistics

Unit: parts per billion (ppb)

IDCityLocationValid h10%30%50%70%90%99%MeanMax 1hMax 24h
12016Windsor WestCollege Ave./South St.87380000140.3272
14111Sarnia700 Christina St. N.8677000001021
29000Hamilton DowntownElgin St./Kelly St.87240000020.1122
71078Sault Ste. MarieSault College8690000001031

Table A10: 10 year trend for NO

Annual mean (ppb)

IDCity/Town2008200920102011201220132014201520162017Percent change over 10 yearsTrend
12008Windsor Downtown5.95.64.74.54.73.743.53.13.3-28.4SSS
12016Windsor West5.15.46.13.84.63.63.84.22.92.6-44.6SSS
13001Chatham3.13.52.61.91.81.61.51.71.41.9-43.3SSS
14111Sarnia3.22.82.23.12.11.71.92.4INS1.5-38.4SSS
15026London3.12.82.93.34.21.41.31.411-65.1SSS
21005Brantford1.31.71.31.21.11.20.91.30.80.8-34.2SSS
26060Kitchener2.52.12.522.11.61.61.61.31-26.8SSS
27067St. Catharines3.63.72.82.32.52.21.72.11.51.2-44.9SSS
28028Guelphn/an/a22.32.21.11.21.31.11.1-54.7SSS
29000Hamilton Downtown6.55.854.84.64.33.91.34.23.9-24.4SSS
29114Hamilton Mountain2.42.52.22.31.9221.81.21.2-40.8SSS
31103Toronto Downtown55.14.13.42.82.72.52.72.62.7-43.6SSS
33003Toronto East9.27.87.87.66.65.76.25.85.44.4-33.6SSS
34021Toronto North7.77.15.76.254.14.33.93.53-46SSS
35125Toronto West16.213.513.412.411.38.69.59.28.27.7-39.8SSS
44008Burlington6.55.954.64.64.64.63.93.93.4-32.3SSS
44017Oakville43.53.62.73.42.13.42.71.81.7-45.9SSS
45026Oshawa3.232.32.32.11.522.32.52.4-8.6N-SSS
46090Brampton5.86.53.74.64.44.643.83.42.2-34.9SSS
46108Mississauga6.15.14.14.13.83.12.93.13.62-34.1SSS
47045Barrie5.55.14.33.83.23.23.73.53.72.6-22.4SSS
48006Newmarket2.63.22.32.221.51.41.71.61.4-40.6SSS
51001Ottawa Downtown2.72.41.61.82.42.11.921.71.5-10.3SSS
51002Ottawa Central2.71.81.41.522.811.61.51.7-1.3N-SSS
52023Kingston1.10.60.30.50.40.20.80.90.70.60.6N-SSS
54012Belleville31.92.32.31.61.71.21.51.81.1-40.8SSS
56051Cornwall3.63.221.92.21.91.51.82.11.2-26.4SSS
59006Peterborough31.91.72.21.81.71.81.51.31.2-24.3SSS
63203Thunder Bay5.15.74.65.95.14.74.25.23.84.1-21.8SSS
71078Sault Ste. Marie1.41.81.921.71.321.711.3-37.9SSS
75010North Bay3.84.23.442.92.52.62.121.6-52.5SSS

Notes:

n/a indicates data not available.

INS indicates there was insufficient data to calculate a valid annual mean.

Station 14111 replaced station 14064 as the Sarnia site in 2016.

Station 15026 replaced station 15025 as the London site in 2013.

Station 34021 replaced station 34020 as the Toronto North site in 2017.

Station 46090 replaced station 46089 as the Brampton site in 2017.

Station 46108 replaced station 46109 as the Mississauga site in 2008.

Station 52023 replaced station 52022 as the Kingston site in 2014.

SSS - Significant Sen's Slope (significant trend detected).

N-SSS - Non-Significant Sen's Slope (significant trend not detected).

Table A11: 10 year trend for NO2

Annual mean (ppb)

IDCity/Town2008200920102011201220132014201520162017Percent change over 10 yearsTrend
12008Windsor Downtown15.214.415.614.513.212.41412.711.411.1-24.4SSS
12016Windsor West16.213.214.512.911.411.511.811.410.69.9-28SSS
13001Chatham77.56.46.65.766.86.85.46.1-9.1SSS
14111Sarnia10.88.288.68.68.199.3INS7.3-11.6SSS
15026London10.898.88.36.36.46.96.65.45.8-35.2SSS
21005Brantford6.97.35.86.15.44.85.55.54.84.4-28.6SSS
26060Kitchener98.67.77.77.16.776.86.25.8-24.4SSS
27067St. Catharines10.49.99.18.58.17.77.37.36.66.6-31.3SSS
28028Guelphn/an/a6.77.36.56.67.16.36.25.9-11.3SSS
29000Hamilton Downtown14.713.612.713.511.912.412.412.211.911.9-13.3SSS
29114Hamilton Mountain10.59.98.99.98.699.397.97.8-18.3SSS
31103Toronto Downtown1716.516.114.913.413.51413.413.313-21.1SSS
33003Toronto East16.514.914.815.21413.614.213.912.111.5-21.8SSS
34021Toronto North16.515.814.315.413.412.913.412.91210.5-28.3SSS
35125Toronto West20.81920.119.116.316.117.116.615.715-25.1SSS
44008Burlington13.612.512.211.8111110.910.410.29.7-21.2SSS
44017Oakville1211.19.210.39.19.28.27.58.28.2-29.3SSS
45026Oshawa8.57.47.275.65.96.86.66.36.4-16.2SSS
46090Brampton13.113.310.711.310.49.110.69.99.78.3-26.5SSS
46108Mississauga12.312.210.410.69.69.59.29.28.68-27.7SSS
47045Barrie10.89.98.78.68.17.88.17.48.17.3-19.8SSS
48006Newmarket87.87.28.17.26.86.86.86.56.3-18.4SSS
51001Ottawa Downtown11.48.67.47.97.87.97.47.46.97.1-18.8SSS
51002Ottawa Central8.16.66.26.66.66.665.85.65.2-19.2SSS
52023Kingston5.554.34.643.63.94.44.44.4-18.1SSS
54012Belleville7.365.56.34.74.74.54.85.14.3-28.8SSS
56051Cornwall7.57.36.56.56.16.25.65.35.55-27.1SSS
59006Peterborough75.654.33.755.35.14.54.7-12.1SSS
63203Thunder Bay8.18.47.88.67.37.37.87.57.16.7-17.2SSS
71078Sault Ste. Marie5.55.15.55.34.855.34.844.4-21.6SSS
75010North Bay7.58.27.67.46.15.85.65.64.74.6-42.5SSS

Notes:

n/a indicates data not available.

INS indicates there was insufficient data to calculate a valid annual mean.

Station 14111 replaced station 14064 as the Sarnia site in 2016.

Station 15026 replaced station 15025 as the London site in 2013.

Station 34021 replaced station 34020 as the Toronto North site in 2017.

Station 46090 replaced station 46089 as the Brampton site in 2017.

Station 46108 replaced station 46109 as the Mississauga site in 2008.

Station 52023 replaced station 52022 as the Kingston site in 2014.

SSS - Significant Sen's Slope (significant trend detected).

Table A12: 10 year trend for NOX

Annual mean (ppb)

IDCity/Town2008200920102011201220132014201520162017Percent change over 10 yearsTrend
12008Windsor Downtown21.12020.218.917.816.21816.214.514.4-26.4SSS
12016Windsor West21.318.620.616.71615.215.715.513.512.5-33.7SSS
13001Chatham10.110.998.47.57.78.28.56.88-25.5SSS
14111Sarnia13.91110.211.710.79.810.911.7INS8.7-18.4SSS
15026London13.911.911.711.610.57.88.386.56.8-43.8SSS
21005Brantford8.29.17.27.36.75.76.46.85.75.3-31.9SSS
26060Kitchener11.510.810.39.69.28.38.58.47.56.9-25.7SSS
27067St. Catharines1413.711.810.910.69.99.19.48.27.9-35.1SSS
28028Gulephn/an/a8.69.58.87.88.47.77.37-21.5SSS
29000Hamilton Downtown21.219.517.818.316.616.816.37.716.115.8-16.5SSS
29114Hamilton Mountain12.912.411.212.210.51111.310.99.29.1-21.2SSS
31103Toronto Downtown22.121.620.318.416.216.116.516.115.915.7-25.5SSS
33003Toronto East25.722.722.622.820.619.420.419.717.515.8-25.2SSS
34021Toronto North24.322.82021.518.51717.716.915.413.5-34.9SSS
35125Toronto West3732.533.531.527.624.726.525.723.822.7-32SSS
44008Burlington2018.417.216.415.615.615.514.314.213.2-26.3SSS
44017Oakville16.114.612.81312.611.211.610.110.19.9-32SSS
45026Oshawa11.710.49.59.27.87.48.88.98.88.8-15.5SSS
46090Brampton18.919.914.415.914.813.914.613.713.110.6-29.3SSS
46108Mississauga18.417.314.514.713.412.612.112.312.29.9-31SSS
47045Barrie16.315.113.112.411.31111.810.911.99.9-19.7SSS
48006Newmarket10.4119.510.39.28.48.28.58.17.8-23.9SSS
51001Ottawa Downtown141199.710.210.19.39.58.68.6-18.6SSS
51002Ottawa Central10.88.47.58.18.79.47.17.57.27-12.8SSS
52023Kingston6.55.74.75.34.63.84.85.35.24.9-17.6SSS
54012Belleville10.27.97.88.76.46.35.76.26.75.4-32.1SSS
56051Cornwall11.110.68.58.48.4877.17.66.2-27.3SSS
59006Peterborough107.56.76.65.46.67.16.65.95.8-15.3SSS
63203Thunder Bay13.214.112.414.512.41211.912.71110.8-18.1SSS
71078Sault Ste. Marie6.96.97.47.26.46.37.36.65.15.8-24.4SSS
75010North Bay11.312.41111.59.18.38.17.86.76.2-47SSS

Notes:

n/a indicates data not available.

INS indicates there was insufficient data to calculate a valid annual mean.

Station 14111 replaced station 14064 as the Sarnia site in 2016.

Station 15026 replaced station 15025 as the London site in 2013.

Station 34021 replaced station 34020 as the Toronto North site in 2017.

Station 46090 replaced station 46089 as the Brampton site in 2017.

Station 46108 replaced station 46109 as the Mississauga site in 2008.

Station 52023 replaced station 52022 as the Kingston site in 2014.

SSS - Significant Sen's Slope (significant trend detected).

Table A13: 10 year trend for PM2.5

Annual mean (μg/m3)

IDCity/Town2008200920102011201220132014201520162017Percent change over 10 yearsTrend
12008Windsor Downtown10.399.49.49.89.210.19.38.17.8-15.2SSS
12016Windsor West10.99.49.69.79.51010.79.98.58.5-12.2SSS
13001Chatham9.288.18.27.58.18.68.16.66.4-17.9SSS
14111Sarnia14.112.212.712.912.78.598.4INS7-50.2SSS
15020Grand Bend8.67.47.87.67.47.38.17.765.1-27.2SSS
15026London8.67.37.87.78.19.18.88.37.17-8.8N-SSS
16015Port Stanley8.47.27.47.57.47.48.286.56.3-12.7SSS
18007Tiverton6.55.35.7665.86.56.45.15.1-11.1SSS
21005Brantford8.67.488.27.88.59.28.77.37.2-3.1N-SSS
26060Kitchener97.47.87.77.78.79.38.87.37-4.9N-SSS
27067St. Catharines9.37.787.87.98.58.88.46.97-8.5SSS
28028Guelph8.27.177.47.48.18.98.46.96.8-1.6N-SSS
29000Hamilton Downtown10.48.69.41010.210.110.810.28.28.5-11SSS
29114Hamilton Mountain9.287.68.38.19.29.497.27.4-11.1N-SSS
29118Hamilton West9.67.88.38.899.69.99.97.97.5-6.7N-SSS
31103Toronto Downtown8.47.17.57.988.38.78.477.4-3.1N-SSS
33003Toronto East8.57.48.37.87.88.28.98.577.4-7.1N-SSS
34021Toronto North9.17.77.79.598.39.29.47.37.4-10.1N-SSS
35125Toronto West9.47.88.18.78.88.89.18.577.4-13.8SSS
44008Burlington8.77.57.77.888.79.69.47.67-3.6N-SSS
44017Oakville8.56.9787.688.58.376.9-4.4N-SSS
45026Oshawa86.776.96.97.47.77.55.95.9-14.7SSS
46090Brampton8.67.27.27.67.28.58.98.46.87-1.1N-SSS
46108Mississauga8.97.47.67.77.57.98.78.57.26.8-11.5SSS
47045Barrie7.86.86.87.27.17.57.67.66.57-2.2N-SSS
48006Newmarket7.66.56.86.97.17.37.37.165.9-11.3SSS
49005Parry Sound6.15.25.5665.85.85.74.84.6-18.3SSS
49010Dorset5.94.85.15.45.35.45.35.64.64.6-8.9SSS
51001Ottawa Downtown6.96.15.76.36.2776.95.95.9-3N-SSS
51002Ottawa Central6.65.85.55.96.57.16.86.95.65.80N-SSS
51010Petawawa5.24.24.24.54.84.84.74.84.44.1-6.4N-SSS
52023Kingston8.88.188.58.36.56.86.35.85.3-37.4SSS
54012Belleville7.86.45.66.26.56.96.86.65.55.8-13.9SSS
56051Cornwall7.8777.36.97.776.96.45.9-17.1SSS
59006Peterborough7.76.46.376.37.46.96.85.85.8-16.4SSS
63203Thunder Bay5.75.15.46.25.46.36.66.54.95.11.2N-SSS
71078Sault Ste. Marie5.85.35.25.75.65.665.94.95-6.9N-SSS
75010North Bay6.15.14.95.55.35.25.35.34.64.6-13.5SSS
77233Sudbury5.54.54.75.25.15.766.35.4515.3SSS

Notes:

From 2008-2012, measurements were taken by TEOM sampler operated at 30°C with a Sample Equilibration System (SES).

As of 2013, measurements taken by Synchronized Hybrid Ambient Real-time Particulate (SHARP) 5030.

An approximate correction factor was applied to the TEOM data prior to 2013 to be comparable to SHARP measurements and generate an approximate 10-year trend.

INS indicates there was insufficient data in any one quarter to calculate a valid annual mean.

Station 14111 replaced station 14064 as the Sarnia site in 2016.

Station 15026 replaced station 15025 as the London site in 2013.

Station 34021 replaced station 34020 as the Toronto North site in 2017.

Station 46090 replaced station 46089 as the Brampton site in 2017.

Station 46108 replaced station 46109 as the Mississauga site in 2008.

Station 52023 replaced station 52022 as the Kingston site in 2014.

SSS - Significant Sen's Slope (significant trend detected).

N-SSS - Non-Significant Sen's Slope (significant trend not detected).

Table A14: 10 year trend for O3

Annual mean (ppb)

IDCity/Town2008200920102011201220132014201520162017Percent change over 10 yearsTrend
12008Windsor Downtown26.924.82827.22826.9262727.727.34.3N-SSS
12016Windsor West25.924.926.726.42826.727.226.527.7277.6SSS
13001Chatham30.928.831.929.729.529.629.329.629.629.5-3.9N-SSS
14111Sarnia28.726.630.729.729.728.627.127.828.828.4-1.4N-SSS
15020Grand Bend31.329.63532.833.232.33130.430.731-4.1N-SSS
15026London2725.128.226.827.728.728.127.928.228.18.3SSS
16015Port Stanley34.330.934.632.833.133.932.332.832.9330.3N-SSS
18007Tiverton32.631.433.832.13232.431.832.533.132.41.4N-SSS
21005Brantford28.426.529.428.728.82929.428.929.528.33.9N-SSS
26060Kitchener28.12729.427.6282827.327.928.828.13.1N-SSS
27067St. Catharines27.525.628.32828.728.628.528.629.828.18.7SSS
28028Guelph27.927.330.728.928.82927.827.728.728.40.8N-SSS
29000Hamilton Downtown25.124.326.925.425.72525.325.926.725.65.5N-SSS
29114Hamilton Mountain2927.229.728.830.229.529.129.429.529.14.3N-SSS
29118Hamilton West23.321.824.524.224.224.422.723.924.4255.5N-SSS
31103Toronto Downtown2624.626.125.426.626.225.725.725.625.61N-SSS
33003Toronto East21.622.12323.324.624.123.423.525.524.413.7SSS
34021Toronto North22.722.124.823.625.725.325.325.725.92413.4SSS
35125Toronto West20.719.520.620.121.521.521.121.322.122.112.5SSS
44008Burlington24.924.126.625.926.726.425.526.527.627.111.9SSS
44017Oakville2725.52826.827.728.327.227.427.127.43.9N-SSS
45026Oshawa2725.52826.62727.227.226.227.227.94N-SSS
46090Brampton26.625.227.526.126.626.726.526.527.127.24.6N-SSS
46108Mississauga24.62425.924.125.625.225.425.42626.29SSS
47045Barrie26.524.326.825.326.325.525.625.425.925.92.2N-SSS
48006Newmarket29.528.631.527.829.428.728.628.528.627.9-3.4N-SSS
49005Parry Sound32.129.731.329.730.130.429.630.429.629.7-3.1N-SSS
49010Dorset29.327.728.6272828.127.72727.426.9-4SSS
51001Ottawa Downtown23.323.425.724.22625.624.825.625.625.59.8SSS
51002Ottawa Central27.424.726.624.825.626.626.62725.526.2-0.2N-SSS
51010Petawawa27.627.327.926.727.727.626.826.726.425.8-5.2SSS
52023Kingston32.730.332.630.332.730.331.430.330.530.4-2.9N-SSS
54012Belleville29.828.53027.92829.229.629.630.530.26.2SSS
56051Cornwall26.625.527.926.127.126.927.327.927.127.22.7N-SSS
59006Peterborough28.227.730.527.929.128.629.229.329.728.95.3SSS
63203Thunder Bay2324.225.725.22526.323.42423.223.4-6.6SSS
71078Sault Ste. Marie28.927.828.427.828.828.928.427.827.328.1-3.4N-SSS
75010North Bay27.726.12826.726.127.426.72726.426.4-0.9N-SSS
77233Sudbury27.925.928.728.728.527.226.325.725.125.9-8.8SSS

Notes:

Station 14111 replaced station 14064 as the Sarnia site in 2016.

Station 15026 replaced station 15025 as the London site in 2013.

Station 34021 replaced station 34020 as the Toronto North site in 2017.

Station 46090 replaced station 46089 as the Brampton site in 2017.

Station 46108 replaced station 46109 as the Mississauga site in 2008.

Station 52023 replaced station 52022 as the Kingston site in 2014.

SSS - Significant Sen's Slope (significant trend detected).

N-SSS - Non-Significant Sen's Slope (significant trend not detected).

Table A15: 10 year trend for O3 summer means (May - September)

Summer Mean (ppb)

IDCity/Town2008200920102011201220132014201520162017Percent change over 10 yearsTrend
12008Windsor Downtown34.130.434.633.836.832.530.933.333.432.8-3N-SSS
12016Windsor West32.129.531.831.935.730.930.931.83331.8-0.1N-SSS
13001Chatham36.732.636.534.436.634.232.434.432.933.1-8.1N-SSS
14111Sarnia3328.634.332.936.63229.431.132.132-4.1N-SSS
15020Grand Bend32.429.737.833.938.933.131.532.33232.1-4.2N-SSS
15026London31.628.432.530.734.430.929.53130.429.8-4.4N-SSS
16015Port Stanley38.833.238.935.538.436.933.735.635.235-9N-SSS
18007Tiverton3430.333.331.73632.530.833.334.132.20.2N-SSS
21005Brantford3127.531.631.133.530.129.931.232.229.40.5N-SSS
26060Kitchener3128.831.630.233.529.828.530.231.829.8-1.9N-SSS
27067St. Catharines31.227.73231.23531.229.531.733.229.81.8N-SSS
28028Guelph30.428.732.531.334.530.428.930.231.229.6-2.4N-SSS
29000Hamilton Downtown29.828.231.628.732.428.427.529.530.627.8-4.3N-SSS
29114Hamilton Mountain33.63134.432.337.432.531.633.933.231.5-2.7N-SSS
29118Hamilton West26.723.927.926.229.226.422.726.527.126.81.5N-SSS
31103Toronto Downtown30.927.931.129.533.330.128.930.829.628.4-4.8N-SSS
33003Toronto East24.925.226.727.430.627.125.927.729.72610.3N-SSS
34021Toronto North26.425.62827.532.729.428.630.730.726.315.2N-SSS
35125Toronto West24.822.524.323.627.524.423.52525.924.34.7N-SSS
44008Burlington28.326.730.229.232.529.227.430.130.5295.8N-SSS
44017Oakville30.828.231.529.934.230.628.330.229.929.5-4.3N-SSS
45026Oshawa28.326.429.528.531.128.327.928.929.428.62.5N-SSS
46090Brampton3128.530.829.332.729.528.930.331.229.50.7N-SSS
46108Mississauga27.326.22926.730.426.526.52828.527.22.6N-SSS
47045Barrie302527.926.229.725.625.426.827.425.6-6.2N-SSS
48006Newmarket32.130.934.430.534.230.329.431.231.729-7.2N-SSS
49005Parry Sound32.228.630.428.732.830.128.231.428.927.7-4.5N-SSS
49010Dorset27.22525.223.828.325.324.424.625.123-8.3N-SSS
51001Ottawa Downtown24.924.626.125.129.326.524.627.827.525.38.2N-SSS
51002Ottawa Central25.326.325.429.42726.226.228.726.725.81.9N-SSS
51010Petawawa24.724.423.822.828.124.522.924.423.421.1-10.5N-SSS
52023Kingston35.432.535.93238.532.432.732.233.330.9-6.8N-SSS
54012Belleville32.330.634.229.932.730.630.433.233.730.92N-SSS
56051Cornwall27.627.129.826.730.728.12729.728.727.10N-SSS
59006Peterborough31.629.23229.834.229.53031.532.329.20N-SSS
63203Thunder Bay21.324.223.924.225.324.722.723.62220.4-13N-SSS
71078Sault Ste. Marie28.427.527.226.430.328.227.428.126.326.3-4.5N-SSS
75010North Bay28.326.528.426.328.526.926.227.826.424.7-7.5N-SSS
77233Sudbury2625.726.326.929.8282727.726.625.82.7N-SSS

Notes:

Station 14111 replaced station 14064 as the Sarnia site in 2016.

Station 15026 replaced station 15025 as the London site in 2013.

Station 34021 replaced station 34020 as the Toronto North site in 2017.

Station 46090 replaced station 46089 as the Brampton site in 2017.

Station 46108 replaced station 46109 as the Mississauga site in 2008.

Station 52023 replaced station 52022 as the Kingston site in 2014.

Station 77233 replaced station 77219 as the Sudbury site in 2013.

N-SSS - Non-Significant Sen's Slope (significant trend not detected).

Table A16: 10 year trend for O3 winter means (January-April, October-December

Winter mean (ppb)

IDCity/Town2008200920102011201220132014201520162017Percent change over 10 yearsTrend
12008Windsor Downtown21.720.823.222.521.722.822.822.423.623.37.9N-SSS
12016Windsor West21.521.622.822.522.323.424.522.723.923.69.8SSS
13001Chatham26.826.128.526.724.326.227.126.327.226.80.6N-SSS
14111Sarnia25.525.228.127.424.726.225.425.4INS26-0.8N-SSS
15020Grand Bend30.529.53332.129.131.830.629.129.830.2-4N-SSS
15026London23.722.82524.222.926.927.125.826.626.917.5SSS
16015Port Stanley3129.431.53129.331.831.331.231.231.51.5N-SSS
18007Tiverton31.732.334.132.229.232.432.731.932.432.61N-SSS
21005Brantford26.625.827.827.125.428.328.827.227.727.54.9N-SSS
26060Kitchener2625.927.825.72426.726.526.126.627.13.5N-SSS
27067St. Catharines24.924.125.625.824.126.827.926.327.22711.5SSS
28028Guelph26.126.429.327.224.828272626.827.52N-SSS
29000Hamilton Downtown21.721.523.523.120.922.523.723.323.924.29.8SSS
29114Hamilton Mountain25.724.526.326.32527.327.326.326.827.47.7SSS
29118Hamilton West20.920.422.122.720.62322.822.122.523.712.5SSS
31103Toronto Downtown22.222.422.422.621.823.523.52222.723.64.5SSS
33003Toronto East19.319.920.420.420.32221.620.522.523.318.6SSS
34021Toronto North20.119.522.520.820.722.322.822.122.622.314.2SSS
35125Toronto West17.717.41817.717.219.519.418.619.420.514.4SSS
44008Burlington22.522.323.923.522.524.424.123.825.625.714.4SSS
44017Oakville24.423.625.524.723.126.626.525.325.125.96.1N-SSS
45026Oshawa25.724.926.925.224.126.426.724.325.627.33.4N-SSS
46090Brampton23.422.825.223.822.224.624.823.824.125.67.3N-SSS
46108Mississauga22.822.523.722.522.224.324.723.624.225.511.1N-SSS
47045Barrie24.223.82624.723.925.525.824.424.826.36.1N-SSS
48006Newmarket27.627.129.425.82627.528.126.626.327.2-2.4N-SSS
49005Parry Sound3230.531.930.428.130.630.629.83031.1-2.8N-SSS
49010Dorset30.729.63129.527.730.130.128.82929.6-3.6N-SSS
51001Ottawa Downtown22.222.625.523.623.524.925.12424.325.610.7SSS
51002Ottawa Central2724.126.824.522.926.326.925.824.526.5-0.6N-SSS
51010Petawawa29.629.530.829.527.529.929.628.528.629.3-3.9N-SSS
52023Kingston30.628.6302928.628.830.428.928.530.2-0.4N-SSS
54012Belleville2826.92726.424.628.229.12728.229.76.1N-SSS
56051Cornwall2624.526.525.724.225.727.626.62627.47.6N-SSS
59006Peterborough2626.729.526.625.52828.627.727.828.78.4N-SSS
63203Thunder Bay24.324.227.126.124.727.423.824.224.225.6-0.5N-SSS
71078Sault Ste. Marie29.328.429.328.927.629.429.227.72829.5-0.6N-SSS
75010North Bay27.225.827.72724.427.827.126.426.427.6-0.7N-SSS
77233Sudbury29.32630.53027.626.625.824.32426.1-20SSS

Notes:

INS indicates there was insufficient data to calculate a valid winter mean.

Station 14111 replaced station 14064 as the Sarnia site in 2016.

Station 15026 replaced station 15025 as the London site in 2013.

Station 34021 replaced station 34020 as the Toronto North site in 2017.

Station 46090 replaced station 46089 as the Brampton site in 2017.

Station 46108 replaced station 46109 as the Mississauga site in 2008.

Station 52023 replaced station 52022 as the Kingston site in 2014.

Station 77233 replaced station 77219 as the Sudbury site in 2013.

SSS - Significant Sen's Slope (significant trend detected).

N-SSS - Non-Significant Sen's Slope (significant trend not detected).

Table A17: 10 year trend for SO2

Annual mean (ppb)

SO2 1y AAQC: 20 ppb

IDCity/Town2008200920102011201220132014201520162017Percent change over 10 yearsTrend
12008Windsor Downtown4.53.53.53.52.82.42.41.91.11-76.1SSS
12016Windsor West4.73.63.23.42.82.62.81.91.40.9-69.5SSS
14111Sarnia7.74.53.95.34.13.83.53.2INS1.7-49.8SSS
29000Hamilton Downtown4.33.33.35.24.84.85.14.33.23.5-23.5SSS
29114Hamilton Mountain332.94.13.72.82.92.61.81.8-50SSS
35125Toronto West1.41.20.91.50.60.60.710.60.5-45.2SSS
51001Ottawa Downtown10.90.20.40.30.30.30.400.1-45.1SSS
71078Sault Ste. Marie1.20.60.70.80.60.80.80.80.60.7-15.7SSS
77233Sudbury21.11.31.51.32.82.42.42.11.317.4N-SSS

Notes:

INS indicates there was insufficient data to calculate a valid annual mean.

Station 14111 replaced station 14064 as the Sarnia site in 2016.

Station 77233 replaced station 77219 as the Sudbury site in 2013.

SSS - Significant Sen's Slope (significant trend detected).

N-SSS - Non-Significant Sen's Slope (significant trend not detected).

Table A18: 10 year trend for CO

1h Maximum (ppm)

CO 1h AAQC: 30 ppm

IDCity/Town2008200920102011201220132014201520162017Percent change over 10 yearsTrend
12008Windsor Downtown1.31.42.53.82.11.91.81.92.32.668.4N-SSS
29000Hamilton Downtown3.352.21.81.722.91.31.42.1-38.3N-SSS
35125Toronto West1.71.61.81.41.41.41.61.31.71.2-18.2N-SSS
51001Ottawa Downtown1.31.41.51.50.90.90.80.80.90.7-49.6SSS

Note:

SSS - Significant Sen's Slope (significant trend detected).

N-SSS - Non-Significant Sen's Slope (significant trend not detected).

Table A19: PM2.5 and ozone CAAQS metric values for designated sites across Ontario (2017)

City/Town24h PM2.5
(micrograms per cubic metre)
Annual PM2.5
(micrograms per cubic metre)
8h Ozone
(parts per billion)
Windsor Downtown198.470*
Sarnia207.867*
Chatham167.167*
London187.568*
Brantford187.868*
Kitchener207.866*
Guelph207.468*
St. Catharines177.566*
Hamilton Downtown22965*
Hamilton Mountain197.967*
Burlington20867*
Oakville197.466*
Mississauga207.566*
Brampton217.467*
Toronto21869*
Oshawa176.567*
Barrie197.162
Peterborough176.270*
Kingston145.866*
Ottawa Downtown186.360
Sudbury145.662
Sault Ste. Marie135.360
Thunder Bay135.551

Note:

Designated sites normally refer to communities with populations greater than 100,000.

Sarnia’s PM2.5 metrics are based on a two-year average.

Toronto reporting is based on Toronto Downtown, Toronto North, Toronto East and Toronto West stations.

The CAAQS for 24h PM2.5 is 28 μg/m3 based on the 98th percentile measurement annually, averaged over three consecutive years.

The CAAQS for annual PM2.5 is 10 μg/m3 based on the annual mean averaged over three consecutive years.

The CAAQS for ozone is 63 ppb based on the consecutive three-year average of the annual 4th highest daily maximum eight-hour running average.

* indicates an exceedance of the CAAQS.

Table A20: 2017 Air Quality Health Index summary

Station IDCity/TownNo. of valid hoursLow risk AQHI=1Low risk AQHI=2Low risk AQHI=3Moderate risk AQHI=4Moderate risk AQHI=5Moderate risk AQHI=6High risk AQHI=7High risk AQHI=8High risk AQHI=9High risk AQHI=10No. of days at least 1 hour > 6
12008Windsor Downtown86301.0936.2651.6610.060.930.0100000
12016Windsor West85961.6443.3245.668.70.6600.010001
13001Chatham86666.757.6531.014.360.2500.020001
14111Sarnia86885.0455.4432.865.640.960.0600000
15020Grand Bend864114.5565.1318.451.60.2300.050003
15026London870110.4757.7327.853.880.07000000
16015Port Stanley864510.6361.923.13.850.4900.030001
18007Tiverton844111.866.8519.062.160.1200.010001
21005Brantford866913.5359.0324.123.250.07000000
26060Kitchener85079.2558.2628.683.740.07000000
27067St. Catharines84936.4658.1330.844.370.2000000
28028Guelph86919.9457.3928.833.760.07000000
29000Hamilton Downtown86672.2337.8445.712.221.820.130.060001
29114Hamilton Mountain87193.5149.9338.667.450.390.050.010001
29118Hamilton West86414.1549.2837.298.630.540.100000
31103Toronto Downtown86431.5334.4649.0613.091.790.060.020001
33003Toronto East87163.644.7141.549.250.850.030.010001
34021Toronto North86826.0750.5334.687.760.90.050.010001
35125Toronto West86951.2235.8649.1512.511.220.010.020001
44008Burlington87313.9246.3240.998.090.620.020.050002
44017Oakville86895.5653.8734.115.750.6900.010001
45026Oshawa866511.457.1726.534.450.400.030002
46090Brampton87286.252.1334.586.450.620.0200000
46108Mississauga87097.4555.431.465.140.54000000
47045Barrie851211.4755.1128.494.410.53000000
48006Newmarket874210.565926.33.920.1900.020001
49005Parry Sound872320.1464.1614.391.310000000
49010Dorset852026.2159.813.310.680000000
51001Ottawa Downtown865715.3455.325.253.720.39000000
51002Ottawa Central873218.5160.9617.512.740.240.0500000
51010Petawawa847429.1760.1110.290.420000000
52023Kingston861311.6860.425.032.720.1400.030001
54012Belleville855410.6963.7522.352.950.2200.050002
56051Cornwall848514.7662.3619.673.010.150.0600000
59006Peterborough872614.8459.5122.183.150.310.0100000
63203Thunder Bay865019.2661.5818.10.910.14000000
71078Sault Ste. Marie869618.4859.121.470.950000000
75010North Bay872321.9661.0515.721.270000000
77233Sudbury832414.4859.3523.142.410.62000000

Table A21: 2017 air quality alert summary

Air quality forecast regionSpecial air quality statementSmog and air health advisory
Algonquin00
Atikokan - Upsala - Quetico00
Attawapiskat00
Bancroft - Bon Echo Park00
Barrie - Orillia - Midland00
Belleville - Quinte - Northumberland00
Big Trout Lake - Sachigo Lake10
Brockville - Leeds and Grenville00
Burk's Falls - Bayfield Inlet00
Chapleau - Gogama00
City of Hamilton20
City of Ottawa00
City of Thunder Bay00
City of Toronto20
Cornwall - Morrisburg00
Dryden - Ignace00
Dufferin - Innisfil00
Dunnville - Caledonia - Haldimand00
Elgin00
Elliot Lake - Ranger Lake00
Fort Frances - Rainy Lake00
Fort Hope - Webequie00
Fort Severn10
Geraldton - Manitouwadge - Hornepayne00
Greater Sudbury and Vicinity00
Grey - Bruce00
Haliburton00
Halton - Peel20
Huron - Perth00
Kapuskasing - Hearst00
Kenora - Nestor Falls10
Kingston - Prince Edward00
Kirkland Lake - New Liskeard - Temagami00
Lake Nipigon - Wabakimi00
London - Middlesex00
Manitoulin - Blind River - Killarney00
Manitoulin - Northshore - Killarney00
Moosonee - Fort Albany00
Niagara00
Nipigon - Marathon - Superior North00
North Bay - West Nipissing00
Oxford - Brant00
Parry Sound - Muskoka - Huntsville00
Peawanuck00
Peterborough - Kawartha Lakes00
Pickle Lake - Wunnummin Lake00
Prescott and Russell00
Red Lake - Ear Falls10
Renfrew - Pembroke - Barry's Bay00
Sandy Lake - Pikangikum30
Sarnia - Lambton20
Sault Ste. Marie - Superior East00
Simcoe - Delhi - Norfolk00
Sioux Lookout - Savant Lake00
Smiths Falls - Lanark - Sharbot Lake00
Stirling - Tweed - South Frontenac00
Superior West00
Timmins - Cochrane00
Waterloo - Wellington00
Wawa - White River - Pukaskwa00
Windsor - Essex - Chatham - Kent10
York - Durham20
Ontario70

Table A22: 2017 benzene annual statistics

Unit: micrograms per cubic metre (μg/m3)

Benzene 24h AAQC: 2.3 μg/m3

Benzene annual AAQC: 0.45 μg/m3

IDCityLocationNo. of Samples10%25%50%75%90%MaxMinMeanStd. Dev.No. of Times Above 24h CriterionNo. of Times Above Annual Criterion
12016Windsor WestCollege Ave./South St.510.2630.3050.3950.5620.6751.4950.1840.450.21500
14111Sarnia700 Christina St.450.2170.3140.5430.7831.0951.6380.1090.6040.37801
15026London42 St. Julien St.460.1620.2010.2890.4280.560.9460.1260.3390.17700
26060KitchenerWest Ave./Homewood Ave.600.220.2910.3820.5270.6481.8580.1610.4460.26400
29000Hamilton DowntownElgin St./Kelly St.580.1890.3080.4480.7391.072.2570.1540.5690.38701
48006NewmarketEagle St. W./McCaffrey Rd.550.1340.2140.3340.4670.5872.4780.0910.3850.33610
51001Ottawa DowntownRideau St./Wurtemburg St.560.1610.2440.3360.4670.6851.0980.1260.3880.21900

Table A23: 2017 toluene annual statistics

Unit: micrograms per cubic metre (μg/m3)

Toluene 24h AAQC (based on odour): 2,000 μg/m3

IDCityLocationNo. of Samples10%25%50%75%90%MaxMinMeanStd. Dev.No. of Times Above 24h Criterion
12016Windsor WestCollege Ave./South St.510.4750.5830.7481.1051.513.6130.3820.9720.6570
14111Sarnia700 Christina St.450.2710.6391.1481.6723.6935.6920.181.551.4220
15026London42 St. Julien St.460.2680.3440.4960.6151.2792.9860.180.6330.5270
26060KitchenerWest Ave./Homewood Ave.600.370.5170.6610.5462.0815.2750.1751.0020.930
29000Hamilton DowntownElgin St./Kelly St.580.380.4710.8761.6152.5756.2020.211.2961.1950
48006NewmarketEagle St. W./McCaffrey Rd.550.1960.3960.6020.9271.5314.3630.0610.8070.7840
51001Ottawa DowntownRideau St./Wurtemburg St.560.3050.4870.6551.1451.5622.1250.1210.8260.4950

Table A24: 2017 ethylbenzene annual statistics

Unit: micrograms per cubic metre (μg/m3)

Ethylbenzene 24h AAQC: 1,000 μg/m3

IDCityLocationNo. of Samples10%25%50%75%90%MaxMinMeanStd. Dev.No. of Times Above 24h Criterion
12016Windsor WestCollege Ave./South St.510.0810.1050.1440.2130.3130.6710.0620.1810.1140
14111Sarnia700 Christina St.450.0490.0930.1950.290.3990.9420.0280.2110.170
15026London42 St. Julien St.460.0450.0620.0890.1180.2040.4780.0150.1060.080
26060KitchenerWest Ave./Homewood Ave.600.0670.0910.110.1820.3420.7950.0350.1640.1440
29000Hamilton DowntownElgin St./Kelly St.580.0610.0820.1370.230.3740.7350.0350.1870.1560
48006NewmarketEagle St. W./McCaffrey Rd.550.0320.0710.0940.1610.2260.6130.0110.1310.1170
51001Ottawa DowntownRideau St./Wurtemburg St.560.0480.0690.0940.1630.1960.3960.0180.120.0730

Table A25: 2017 m-, and p-xylene annual statistics

Unit: micrograms per cubic metre (μg/m3)

IDCityLocationNo. of Samples10%25%50%75%90%MaxMinMeanStd. Dev.
12016Windsor WestCollege Ave./South St.510.2030.270.3840.5940.9112.0620.1620.5050.381
14111Sarnia700 Christina St.450.1140.2380.4830.6180.8092.3110.0540.4990.395
15026London42 St. Julien St.460.0960.1520.2130.2790.541.460.0110.2690.244
26060KitchenerWest Ave./Homewood Ave.600.1430.2230.260.5031.0442.3850.0750.4510.459
29000Hamilton DowntownElgin St./Kelly St.580.1260.2120.3520.6631.0372.4710.0850.5320.517
48006NewmarketEagle St. W./McCaffrey Rd.550.0850.1610.2320.4180.6422.0160.0150.350.362
51001Ottawa DowntownRideau St./Wurtemburg St.560.0970.1790.2610.470.571.6440.0360.3360.259

Table A26: 2017 o-xylene annual statistics

Unit: micrograms per cubic metre (μg/m3)

IDCityLocationNo. of Samples10%25%50%75%90%MaxMinMeanStd. Dev.
12016Windsor WestCollege Ave./South St.510.0820.1090.1430.2180.3410.7280.0660.190.132
14111Sarnia700 Christina St.450.0450.0940.1820.2460.3110.8710.0220.1930.15
15026London42 St. Julien St.460.0390.0580.0840.1040.2160.5130.0060.1040.089
26060KitchenerWest Ave./Homewood Ave.600.0590.0840.1040.1860.3670.8150.0310.1640.155
29000Hamilton DowntownElgin St./Kelly St.580.0510.0820.1310.2490.4080.8360.0330.1990.181
48006NewmarketEagle St. W./McCaffrey Rd.550.0340.0640.0920.160.2290.6170.0070.1280.118
51001Ottawa DowntownRideau St./Wurtemburg St.560.0430.0770.1030.1810.2130.5790.0180.1330.094

Table A27: 2017 1,3-butadiene annual statistics

Unit: micrograms per cubic metre (μg/m3)

1,3-Butadiene Annual AAQC: 2.0 μg/m3

IDCityLocationNo. of Samples10%25%50%75%90%MaxMinMeanStd. Dev.No. of Times Above Annual Criterion
12016Windsor WestCollege Ave./South St.510.0140.0190.0260.0320.0450.0980.0070.0280.0160
14111Sarnia700 Christina St.450.0150.020.0290.0980.1720.4530.0050.0710.0890
15026London42 St. Julien St.460.0080.010.0160.0230.0290.0980.0060.020.0160
26060KitchenerWest Ave./Homewood Ave.600.010.0120.0230.0360.0530.1490.0070.0290.0250
29000Hamilton DowntownElgin St./Kelly St.580.0120.0150.0240.0390.0540.1340.010.0330.0250
48006NewmarketEagle St. W./McCaffrey Rd.550.0090.010.0160.0250.0360.0760.0040.020.0150
51001Ottawa DowntownRideau St./Wurtemburg St.560.0110.0180.0230.0310.0450.0980.0070.0280.0190

Table A28: 10 year trend for benzene

Annual mean (μg/m3)

IDCity/Town2008200920102011201220132014201520162017Percent change over 10 yearsTrend
12016Windsor West0.7650.750.687INS0.5580.5190.610.5660.5230.45-33.7SSS
14111SarniaINS0.8490.961INS0.9030.821.0071.1910.6960.604-16SSS
15026LondonINS0.4740.49INS0.4550.4130.4460.4510.3550.339-27.2SSS
26060Kitchener0.5450.510.537INS0.479n/a0.4830.5480.4060.446-16.5SSS
29000Hamilton Downtown0.910.9871.06INS0.977INS0.8991.0920.6830.569-21.1SSS
48006Newmarket0.5530.4420.416n/a0.3740.4060.4220.4250.3420.385-20.7SSS
51001Ottawa Downtown0.5610.5170.4510.4180.4230.4420.4130.4530.3770.388-21.1SSS

Notes:

INS indicates there was insufficient data to calculate a valid annual mean.

n/a indicates data not available.

The 2016 average for Sarnia is derived from data from May to December 2016.

Station 14111 replaced station 14064 as the Sarnia site in 2016.

SSS - Significant Sen's Slope (significant trend detected).

Table A29: 10 year trend for toluene

Annual mean (μg/m3)

IDCity/Town2008200920102011201220132014201520162017Percent change over 10 yearsTrend
12016Windsor West1.871.7261.679INS1.3921.0171.5421.2481.2720.972-34SSS
14111SarniaINS2.6012.043INS2.541.5881.9082.351.7781.55-17.4N-SSS
15026LondonINS1.7271.334INS1.4090.8870.8391.0130.7270.633-64.2SSS
26060Kitchener1.8011.6421.477INS1.327n/a1.2781.0521.021.002-37.2SSS
29000Hamilton Downtown3.8212.2272.842INS2.067INS2.2292.2491.6421.296-30.8SSS
48006Newmarket1.2661.0110.882n/a0.8780.9170.7321.341.1180.807-17.4SSS
51001Ottawa Downtown1.9361.6651.2120.9290.9020.9750.7410.9820.9020.826-38.5SSS

Notes:

INS indicates there was insufficient data to calculate a valid annual mean.

n/a indicates data not available.

The 2016 average for Sarnia is derived from data from May to December 2016.

Station 14111 replaced station 14064 as the Sarnia site in 2016.

SSS - Significant Sen's Slope (significant trend detected).

N-SSS - Non-Significant Sen's Slope (significant trend not detected).

Table A30: 10 year trend for ethylbenzene

Annual mean (μg/m3)

IDCity/Town2008200920102011201220132014201520162017Percent change over 10 yearsTrend
12016Windsor West0.2940.2780.276INS0.2250.1790.2680.2390.2350.181-26.1SSS
14111SarniaINS0.4030.392INS0.280.2560.2530.3630.2830.211-34.1SSS
15026LondonINS0.2190.192INS0.150.1260.1220.1510.110.106-51SSS
26060Kitchener0.3020.2120.223INS0.169n/a0.1680.170.1590.164-26SSS
29000Hamilton Downtown0.3360.2910.279INS0.199INS0.1930.2120.1860.187-27.1SSS
48006Newmarket0.2140.1640.159n/a0.1210.1350.1260.2490.2170.131-11.9SSS
51001Ottawa Downtown0.2570.210.1490.1280.1110.1140.1020.1250.1210.12-35SSS

Notes:

INS indicates there was insufficient data to calculate a valid annual mean.

n/a indicates data not available.

The 2016 average for Sarnia is derived from data from May to December 2016.

Station 14111 replaced station 14064 as the Sarnia site in 2016.

SSS - Significant Sen's Slope (significant trend detected).

Table A31: 10 year trend for m-, p-xlyene

Annual mean (μg/m3)

IDCity/Town2008200920102011201220132014201520162017Percent change over 10 yearsTrend
12016Windsor West0.8610.8490.818INS0.6970.5360.8250.7010.6350.505-31.6SSS
14111SarniaINS1.1560.791INS0.6830.5110.6270.8520.4960.499-31.7SSS
15026LondonINS0.6070.501INS0.3950.3460.3230.40.2690.269-54.2SSS
26060Kitchener0.8020.6080.642INS0.486n/a0.4730.4640.4350.451-27.8SSS
29000Hamilton Downtown0.9620.8550.842INS0.61INS0.5950.6210.5180.532-31SSS
48006Newmarket0.590.4590.443n/a0.3410.3640.3360.5840.4860.35-19.7SSS
51001Ottawa Downtown0.720.6220.4350.3590.3220.3320.3170.3650.3410.336-32.7SSS

Notes:

INS indicates there was insufficient data to calculate a valid annual mean.

n/a indicates data not available.

The 2016 average for Sarnia is derived from data from May to December 2016.

Station 14111 replaced station 14064 as the Sarnia site in 2016.

SSS - Significant Sen's Slope (significant trend detected).

Table A32: 10 year trend for o-xlyene

Annual mean (μg/m3)

IDCity/Town2008200920102011201220132014201520162017Percent change over 10 yearsTrend
12016Windsor West0.2940.2750.257INS0.2330.1860.2860.240.2320.19-22.5SSS
14111SarniaINS0.2940.262INS0.2480.1720.2270.3150.1790.193-24.9N-SSS
15026LondonINS0.1860.152INS0.1350.1210.1180.150.1060.104-34.9SSS
26060Kitchener0.260.1910.192INS0.162n/a0.170.1680.1540.164-23.7SSS
29000Hamilton Downtown0.320.2690.243INS0.202INS0.2080.2210.190.199-14.8SSS
48006Newmarket0.1960.1490.136n/a0.1170.1290.1380.2210.1940.128-8.7N-SSS
51001Ottawa Downtown0.2580.2060.1520.1330.1220.1230.1150.1370.1280.133-26.6SSS

Notes:

INS indicates there was insufficient data to calculate a valid annual mean.

n/a indicates data not available.

The 2016 average for Sarnia is derived from data from May to December 2016.

Station 14111 replaced station 14064 as the Sarnia site in 2016.

SSS - Significant Sen's Slope (significant trend detected).

N-SSS - Non-Significant Sen's Slope (significant trend not detected).

Table A33: 10 year trend for 1,3-butadiene

Annual mean (μg/m3)

IDCity/Town2008200920102011201220132014201520162017Percent change over 10 yearsTrend
12016Windsor West0.060.0580.054INS0.0460.0380.0460.0370.0360.028-46.6SSS
14111SarniaINS0.2280.158INS0.2020.210.1240.2180.0890.071-25.4SSS
15026LondonINS0.0370.035INS0.0310.0250.0290.0280.0190.02-42.5SSS
26060Kitchener0.0420.040.043INS0.034n/a0.0320.0320.0250.029-39.4SSS
29000Hamilton Downtown0.0540.0520.055INS0.044INS0.0360.0410.0280.033-37.5N-SSS
48006Newmarket0.0350.0290.026n/a0.0230.0240.020.030.0220.02-23.3N-SSS
51001Ottawa Downtown0.0560.0490.0410.0390.0330.0380.0280.0330.0290.028-39.9N-SSS

Notes:

INS indicates there was insufficient data to calculate a valid annual mean.

n/a indicates data not available.

The 2016 average for Sarnia is derived from data from May to December 2016.

Station 14111 replaced station 14064 as the Sarnia site in 2016.

SSS - Significant Sen's Slope (significant trend detected).

N-SSS - Non-Significant Sen's Slope (significant trend not detected).