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Occupational Health and Safety Act

R.R.O. 1990, REGULATION 833

CONTROL OF EXPOSURE TO BIOLOGICAL OR CHEMICAL AGENTS

Consolidation Period:  From June 10, 2019 to the e-Laws currency date.

Last amendment: 185/19.

Legislative History: 513/92, 597/94, 388/00, 100/04, 16/05, 77/05, 177/05, 607/05, 83/07, 248/08, 491/09, 419/10, 149/12, CTR 16 MA 14 - 2, 274/14, 347/15, 287/17, 185/19.

This is the English version of a bilingual regulation.

1. In this Regulation,

“ACGIH” means the American Conference of Governmental Industrial Hygienists; (“ACGIH”)

“ACGIH Table” means the table entitled “Adopted Values” shown at pages 11 to 61 of the publication entitled 2015 Threshold Limit Values for Chemical Substances and Physical Agents & Biological Exposure Indices published by ACGIH and identified by International Standard Book Number 978-1-607260-77-6; (“tableau de l’ACGIH”)

Note: On January 1, 2020, section 1 of the Regulation is amended by adding the following definitions: (See: O. Reg. 185/19, s. 1 (1))

“airline respirator” means a respirator and air supply hose with a hood or helmet, a tight-fitting facepiece, or a loose-fitting facepiece or visor, that is supplied with compressed breathing air from a compressed breathing air system; (“appareil de protection respiratoire à adduction d’air”)

“air-purifying respirator” means a respirator with an air-purifying filter, cartridge or canister that removes specific air contaminants by passing ambient air through the air-purifying element; (“appareil de protection respiratoire à épuration d’air”)

“assigned protection factor” means the anticipated level of respiratory protection that would be provided by a properly functioning respirator or class of respirators to properly fitted and trained users; (“facteur de protection caractéristique”)

“C” or “ceiling limit” means the maximum airborne concentration of a biological or chemical agent to which a worker may be exposed at any time; (“C”, “valeur C”, “valeur plafond”)

“chemical agent” includes a chemical substance; (“agent chimique”)

Note: On January 1, 2020, section 1 of the Regulation is amended by adding the following definition: (See: O. Reg. 185/19, s. 1 (1))

“direct-reading instrument” means a combustible gas indicator, oxygen meter, colorimetric indicator tube, organic vapour monitor or other instrument that can immediately detect and provide a measurement of an airborne chemical agent; (“instrument à lecture directe”)

“exposure” means exposure by inhalation, ingestion, skin absorption or skin contact; (“exposition”)

Note: On January 1, 2020, section 1 of the Regulation is amended by adding the following definitions: (See: O. Reg. 185/19, s. 1 (1))

“HEPA filter” means a high efficiency particulate air filter that is at least 99.97 per cent efficient in removing particles with a mean aerodynamic diameter of 0.3 micrometres from the air; (“filtre HEPA”)

“IDLH atmosphere” means an atmosphere that poses an immediate threat to life or that will cause irreversible adverse health effects or impair a worker’s ability to escape from the environment; (“atmosphère DIVS”)

“maximum use concentration” means the maximum concentration of an airborne biological or chemical agent that a respirator can be expected to protect a worker using the respirator from, as determined by multiplying the assigned protection factor set out in Schedule 2 for the respirator, or, if applicable, the simulated workplace protection factor for the respirator, by the occupational exposure limit set out for the substance in the Ontario Table or in the ACGIH Table; (“concentration d’utilisation maximale”)

“NIOSH” means the National Institute for Occupational Safety and Health; (“NIOSH”)

“Ontario Table” means Table 1 to this Regulation; (“tableau de l’Ontario”)

Note: On January 1, 2020, section 1 of the Regulation is amended by adding the following definitions: (See: O. Reg. 185/19, s. 1 (1))

“powered air-purifying respirator” means an air-purifying respirator that, by means of a powered blower worn by the user, passes ambient air through an air-purifying element and then supplies purified air to a helmet, hood, facepiece or visor worn by the user; (“appareil de protection respiratoire à épuration d’air à ventilation assistée”)

“qualitative fit test” means a qualitative fit test method set out in Annex B of CSA Standard CAN/CSA-Z94.4-18, Selection, Use and Care of Respirators (September 2018); (“essai d’ajustement qualitatif”)

“quantitative fit test” means a quantitative fit test method set out in Annex C of CSA Standard CAN/CSA-Z94.4-18, Selection, Use and Care of Respirators (September 2018); (“essai d’ajustement quantitatif”)

“self-contained breathing apparatus” means a respirator that has a portable supply of breathing gas that is independent of the ambient atmosphere; (“appareil de protection respiratoire autonome”)

“standard method for workplace air sampling and analysis” means a current standard method for measuring a biological or chemical agent that is published by,

(a) ASTM International,

(b) the Health and Safety Executive (UK),

(c) the Institut de recherche Robert-Sauvé en santé et en sécurité du travail (Québec),

(d) the International Organization for Standardization,

(e) NIOSH,

(f) the Occupational Safety and Health Administration, United States Department of Labor, or

(g) the United States Environmental Protection Agency; (“méthode normalisée d’échantillonnage et d’analyse de l’air d’un lieu de travail”)

“STEL” or “short-term exposure limit” means the maximum airborne concentration of a biological or chemical agent to which a worker may be exposed in any 15-minute period; (“LECT”, “limite d’exposition à court terme”)

Note: On January 1, 2020, the definition of “STEL” or “short-term exposure limit” in section 1 of the Regulation is revoked and the following substituted: (See: O. Reg. 185/19, s. 1 (2))

“STEL” or “short-term exposure limit” means the maximum airborne concentration of a biological or chemical agent to which a worker may be exposed,

(a) in any 15-minute period,

(b) no more than four times during an eight hour work shift, and

(c) with at least one hour between exposures; (“LECT”, “limite d’exposition à court terme”)

Note: On January 1, 2020, section 1 of the Regulation is amended by adding the following definitions: (See: O. Reg. 185/19, s. 1 (1))

“SWPF” or “simulated workplace protection factor” means a surrogate measure of the workplace protection provided by a respirator, as determined in a controlled laboratory setting that simulates a workplace setting; (“FPSMT”, “facteur de protection simulé en milieu de travail”)

“tight-fitting” means designed to form a complete seal with the user’s face or neck; (“hermétique”)

“TWA” or “time-weighted average limit” means the time-weighted average airborne concentration of a biological or chemical agent to which a worker may be exposed in a work day or work week. (“LMPT”, “limite moyenne pondérée dans le temps”)  O. Reg. 491/09, s. 1; O. Reg. 149/12, s. 1; O. Reg. 274/14, s. 1; O. Reg. 287/17, s. 1.

2. (1) Revoked: O. Reg. 347/15, s. 1.

(2) This Regulation does not apply,

(a) to a chemical agent listed in Table 1 of Ontario Regulation 490/09 (Designated Substances) made under the Act, in a workplace that is subject to that regulation with respect to that agent; or

(b) with respect to asbestos, in a workplace that is subject to Ontario Regulation 278/05 (Designated Substance — Asbestos on Construction Projects and in Buildings and Repair Operations) made under the Act.  O. Reg. 491/09, s. 2.

2.1 Codes of practice relating to exposure of workers to biological or chemical agents that have been approved by the Minister for the purposes of subsection 32.2 (1) of the Act are available on the Ministry’s or the Government of Ontario’s website. O. Reg. 347/15, s. 2.

3. (1) Every employer shall take all measures reasonably necessary in the circumstances to protect workers from exposure to a hazardous biological or chemical agent because of the storage, handling, processing or use of such agent in the workplace.  R.R.O. 1990, Reg. 833, s. 3 (1).

(2) The measures to be taken shall include the provision and use of,

(a) engineering controls;

(b) work practices;

(c) hygiene facilities and practices; and

(d) if section 7.2 applies, personal protective equipment.  O. Reg. 491/09, s. 3.

Note: On January 1, 2020, subsection 3 (2) of the Regulation is revoked and the following substituted: (See: O. Reg. 185/19, s. 2)

(2) The measures to be taken shall include the provision and use of,

(a) substitution of the hazardous biological or chemical agent;

(b) engineering controls;

(c) administrative controls, including work practices;

(d) hygiene facilities and practices; and

(e) if section 7.2 applies, personal protective equipment. O. Reg. 185/19, s. 2.

4. Without limiting the generality of section 3, every employer shall take the measures required by that section to limit the exposure of workers to a hazardous biological or chemical agent in accordance with the following rules:

1. If the agent is listed in the Ontario Table, exposure shall not exceed the TWA, STEL, or C set out in the Ontario Table.

2. If the agent is not listed in the Ontario Table but is listed in the ACGIH Table, exposure shall not exceed the TWA, STEL, or C set out in the ACGIH Table.

3. If the Table that applies under paragraph 1 or 2 sets out a TWA for an agent but sets out neither a STEL nor a C for that agent, exposure shall not exceed the following excursion limits:

i. Three times the TWA for any period of 30 minutes.

ii. Five times the TWA at any time.

4. Paragraph 3 does not apply with respect to an agent that is prescribed as a designated substance under Ontario Regulation 490/09 (Designated Substances) made under the Act.  O. Reg. 491/09, s. 4.

5. In determining the exposure of workers to a hazardous biological or chemical agent under section 3 or 4, no regard shall be had to the wearing and use of personal protective equipment.  R.R.O. 1990, Reg. 833, s. 5.

Note: On January 1, 2020, section 5 of the Regulation is revoked. (See: O. Reg. 185/19, s. 3)

6. Airborne concentrations of hazardous biological or chemical agents and daily and weekly time-weighted average exposures shall be calculated in accordance with the rules set out in Schedule 1.  O. Reg. 491/09, s. 5.

Note: On January 1, 2020, section 6 of the Regulation is revoked and the following substituted: (See: O. Reg. 185/19, s. 4)

Measuring airborne concentrations

6. (1) An employer shall ensure that procedures for monitoring, sampling and determining airborne concentrations of a biological or chemical agent and worker exposure to airborne concentrations of a biological or chemical agent,

(a) comply with,

(i) a standard method for workplace air sampling and analysis or another method recognized in industrial hygiene practice, and

(ii) the rules set out in Schedule 1 to this Regulation; and

(b) are performed by, or under the direction of, a person who is qualified because of knowledge, training and experience in industrial hygiene practice. O. Reg. 185/19, s. 4.

(2) If a direct-reading instrument is used to determine airborne concentrations of a biological or chemical agent, the employer shall ensure that the instrument is used, calibrated and maintained in accordance with the manufacturer’s instructions. O. Reg. 185/19, s. 4.

7. If the listing for an agent in the Ontario Table or in the ACGIH Table includes the notation “Skin” and the agent is present at the workplace, the employer shall take all measures reasonably necessary in the circumstances to protect workers from skin absorption of the agent.  O. Reg. 491/09, s. 5.

7.1 If the listing for an agent in the ACGIH Table includes the reference “Simple asphyxiant” or “see Appendix F: Minimal Oxygen Content” and the agent is present in the air at the workplace, the employer shall take all measures reasonably necessary in the circumstances to protect workers from,

(a) exposure to an atmospheric oxygen level that is less than 19.5 per cent by volume; and

(b) related hazards such as fire and explosion.  O. Reg. 491/09, s. 5; O. Reg. 287/17, s. 2.

7.2 (1) An employer shall protect workers from exposure to a hazardous biological or chemical agent without requiring them to wear and use personal protective equipment, unless subsection (2) applies or the employer complies with an applicable code of practice.  O. Reg. 491/09, s. 5; O. Reg. 347/15, s. 3.

(2) The employer shall provide, and workers shall wear and use, personal protective equipment appropriate in the circumstances to protect the workers from exposure to the agent, if engineering controls required by this Regulation,

(a) are not in existence or are not obtainable;

(b) are not reasonable or not practical to adopt, install or provide because of the duration or frequency of the exposures or because of the nature of the process, operation or work;

(c) are rendered ineffective because of a temporary breakdown of the controls; or

(d) are ineffective to prevent, control or limit exposure because of an emergency.  O. Reg. 491/09, s. 5.

Note: On January 1, 2020, section 7.2 of the Regulation is revoked and the following substituted: (See: O. Reg. 185/19, s. 5)

Protection from biological or chemical agents

7.2. (1) An employer shall protect workers from exposure to a hazardous biological or chemical agent without requiring them to wear and use a respirator, unless subsection (2) applies or the employer complies with an applicable code of practice. O. Reg. 185/19, s. 5.

(2) The employer shall provide, and workers shall wear and use, a respirator appropriate in the circumstances to protect the workers from exposure to the agent,

(a) if substitution of the agent is not reasonable or not practical; and

(b) if engineering controls required by this Regulation,

(i) are not in existence or are not obtainable,

(ii) are not reasonable or not practical to adopt, install or provide because of the duration or frequency of the exposures or because of the nature of the process, operation or work,

(iii) are rendered ineffective because of a temporary breakdown of the controls, or

(iv) are ineffective to prevent, control or limit exposure because of an emergency. O. Reg. 185/19, s. 5.

(3) An employer who provides a worker with a respirator shall comply with the requirements set out in sections 9 to 13 of this Regulation. O. Reg. 185/19, s. 5.

8. (1) If a worker has been exposed to a hazardous biological or chemical agent and,

(a) the worker or the worker’s physician has reason to believe that the worker’s health has been affected by exposure to the agent and the worker or the worker’s physician has so notified the employer in writing; or

(b) the employer has reason to believe that the worker’s health is likely to be affected by the exposure and the employer has so notified the worker in writing,

the worker, if he or she agrees, shall undergo medical examinations and clinical tests, at the employer’s expense, to determine whether the worker has an occupational illness because of exposure to the agent and whether the worker is fit, fit with limitations or unfit to continue working in exposure to the agent.  O. Reg. 491/09, s. 6.

(2), (3) Revoked:  O. Reg. 491/09, s. 6.

(4) The employer shall provide the physician who examines the worker or under whose supervision clinical tests are performed with a copy of the records, if any, of the exposure of the worker to the hazardous biological or chemical agent.  R.R.O. 1990, Reg. 833, s. 8 (4).

9. Revoked:  O. Reg. 607/05, s. 3 (2).

Note: On January 1, 2020, the Regulation is amended by adding the following sections: (See: O. Reg. 185/19, s. 6)

Respiratory Protection Program

Employer duties: respirators

9. (1) An employer who provides a worker with a respirator shall ensure that the respirator,

(a) is appropriate in the circumstances for the form and concentration of airborne biological or chemical agent in respect of which the respirator is to be used;

(b) meets or exceeds the requirements set out in this section and sections 10 to 13; and

(c) is used by workers in accordance with the requirements of this section and sections 10 to 13. O. Reg. 185/19, s. 6.

(2) An employer who provides a worker with a respirator shall establish written measures and procedures regarding the selection, care and use of respirators. O. Reg. 185/19, s. 6.

(3) An employer who provides a worker with a respirator shall provide training and instruction to the worker in the care and use of the respirator before the worker first uses the respirator. O. Reg. 185/19, s. 6.

(4) The training and instruction required under subsection (3) shall include training and instruction on the following:

1. Limitations of the respirator.

2. Inspection and maintenance of the respirator, including, in the case of an air-purifying respirator, end of service life indicators or change out schedules for the cartridge, canister or filter.

3. Proper fitting of the respirator.

4. Cleaning and disinfecting the respirator. O. Reg. 185/19, s. 6.

Respirator requirements

10. (1) A respirator must meet the following requirements:

1. It must be,

i. approved by NIOSH; or

ii. approved by a testing and certification agency other than NIOSH and, in the opinion of a person qualified because of knowledge, training and experience in industrial hygiene practice, afford the worker using it protection at least equal to the protection afforded by the use of a respirator approved by NIOSH.

2. It must meet or exceed the applicable assigned protection factor set out in Schedule 2. O. Reg. 185/19, s. 6.

(2) An employer who provides a worker with a respirator shall have regard to the following when selecting the respirator:

1. The airborne concentration of the biological or chemical agent to which the worker is exposed, calculated in accordance with Schedule 1, and the maximum use concentration of the respirator.

2. The manufacturer’s information on the intended use, scope and limitations of the respirator.

3. The potential for an atmosphere with an oxygen concentration of less than 19.5 per cent, an IDLH atmosphere, or oil in the atmosphere. O. Reg. 185/19, s. 6.

(3) If a respirator is used to protect a worker from exposure to asbestos, it must be,

(a) equipped with a HEPA filter; or

(b) equipped with a N-100, R-100 or P-100 particulate filter. O. Reg. 185/19, s. 6.

(4) If an airline respirator is used in an IDLH atmosphere, it must be fitted with an auxiliary supply of breathing air that is sufficient to permit the worker to escape unassisted from the atmosphere. O. Reg. 185/19, s. 6.

(5) If a respirator is supplied with breathing air from an air cylinder or a compressed breathing air system, the following requirements must be met:

1. The breathing air must meet the purity requirements set out in Table 1 of CSA Standard CAN/CSA-Z180.1-13 (R2018), Compressed Breathing Air and Systems (2018).

2. If a compressed breathing air system uses a compressor with an operating pressure greater than 103.4 kPa to supply the breathing air, the breathing air must be tested at least once every six months to ensure that it meets the requirement set out in paragraph 1.

3. The air intake used in connection with a compressed breathing air system must,

i. for breathing air delivered by a compressor with an operating pressure greater than 103.4 kPa, be located in accordance with section 6 (Air intakes) and Annex A of CSA Standard CAN/CSA-Z180.1-13 (R2018), Compressed Breathing Air and Systems (2018), and

ii. for breathing air delivered by an ambient air system, be located in accordance with section 6 (Air intakes) and Annex B of CSA Standard CAN/CSA-Z180.1-13 (R2018), Compressed Breathing Air and Systems (2018),

4. If a compressed breathing air system uses an oil-lubricated compressor to supply the breathing air,

i. a continuous carbon monoxide monitor equipped with audible and visual alarms that activate at 5 ppm must be provided, and

ii. the continuous carbon monoxide monitor must be calibrated in accordance with the manufacturer’s instructions. O. Reg. 185/19, s. 6.

Requirements: use of respirator

11. (1) A respirator shall be used in accordance with the manufacturer’s instructions. O. Reg. 185/19, s. 6.

(2) A worker shall not be assigned to an operation that requires the use of a respirator unless the worker is physically able to perform the operation while using the respirator. O. Reg. 185/19, s. 6.

Requirements: tight-fitting respirator

12. (1) A respirator that is designed to be tight-fitting shall be tested for fit in accordance with one of the following:

1. A qualitative fit test.

2. A quantitative fit test. O. Reg. 185/19, s. 6.

(2) A worker shall conduct positive and negative pressure user seal checks prior to every use of a tight-fitting elastomeric respirator. O. Reg. 185/19, s. 6.

(3) A respirator that is designed to be tight-fitting shall not be provided to, or used by, a worker with facial hair that comes between the sealing surface of the facepiece and the face or that interferes with the functioning of the respirator. O. Reg. 185/19, s. 6.

Requirements: care and maintenance of respirator

13. A respirator shall be cared for and maintained in accordance with the manufacturer’s instructions. O. Reg. 185/19, s. 6.

Table 1
Ontario Table of Occupational Exposure limits

Listing

French Listing Equivalent

Agent [CAS No.]

Time-Weighted Average Limit (TWA)

Short-Term Exposure Limit (STEL) or Ceiling Limit (C)

Notations

1.

4.

*Acrylonitrile [107-13-1]

2 ppm

C 10 ppm

Skin

2a.

50a.

Revoked:  O. Reg. 287/17, s. 3 (1)

 

 

 

2b.

50b.

Revoked:  O. Reg. 287/17, s. 3 (1)

 

 

 

3.

7.

*Arsenic, elemental arsenic and inorganic compounds [7440-38-2], and organic compounds (only where both inorganic and organic compounds are present), as As.

0.01 mg/m3

0.05 mg/m3

 

4a.

5a.

*Asbestos

– All forms [1332-21-4]

0.1 f/cc (F)

 

 

4b.

5b.

*Asbestos

– Actinolite [77536-66-4]

0.1 f/cc (F)

 

 

4c.

5c.

*Asbestos

– Amosite [12172-73-5]

0.1 f/cc (F)

 

 

4d.

5d.

*Asbestos

– Anthophyllite [77536-67-5]

0.1 f/cc (F)

 

 

4e.

5e.

*Asbestos

– Chrysotile [132207-32-0]

0.1 f/cc (F)

 

 

4f.

5f.

*Asbestos

– Crocidolite [12001-28-4]

0.1 f/cc (F)

 

 

4g.

5g.

*Asbestos

– Tremolite [77536-68-6]

0.1 f/cc (F)

 

 

5.

10.

Benzaldehyde [100-52-7]

 

4 ppm, or 17 mg/m3

 

6.

11.

*Benzene [71-43-2]

0.5 ppm

2.5 ppm

Skin

7.

12.

Revoked:  O. Reg. 287/17, s. 3 (1)

 

 

 

8.

19.

Calcium chloride [10043-52-4]

5 mg/m3

 

 

9.

15.

Carbon tetrachloride [56-23-5]

2 ppm

3 ppm

Skin

10.

16.

Charcoal, except activated [16291-96-6]

10 mg/m3

 

 

11.

66.

Chlorinated diphenyl oxides [55720-99-5]

0.5 mg/m3

2 mg/m3

 

12.

17.

o-Chlorobenzaldehyde [89-98-5]

 

4 ppm, or 23 mg/m3

 

13a.

14a.

Chlorodiphenyl (42 per cent chlorine) [53469-21-9]

See listing for Polychlorinated Biphenyls (PCBs)

 

 

13b.

14b.

Chlorodiphenyl (54 per cent chlorine) [11097-69-1]

See listing for Polychlorinated Biphenyls (PCBs)

 

 

14.

22.

N-Cocomorpholine [1541-81-7]

5 ppm, or 52 mg/m3

 

Skin

15.

46.

*Coke Oven Emissions1

0.15 mg/m3

 

 

16.

87.

Coumarone-Indene Resins (total dust) [63393-89-5]

5 mg/m3

 

 

17.

24.

Cymene (sum of o-, m- and p-isomers) [25155-15-1]

50 ppm, or 274 mg/m3

 

Skin

18.

28.

1,1-Dichloroethene [75-35-4]

1 ppm, or 4 mg/m3

20 ppm, or 80 mg/m3

 

19.

29.

1,3-Dichloro-2-Propanol [96-23-1]

 

1 ppm, or 5 mg/m3

Skin

20.

40.

Diethylene glycol monoethyl ether [111- 90-0]

30 ppm, or 165 mg/m3

 

 

21.

74.

Di(2-ethylhexyl)phthalate (DEHP) [117-81-7]

3 mg/m3

5 mg/m3

 

22.

73.

Diisodecyl phthalate [26761-40-0]

5 mg/m3

 

 

23.

30.

3-(Dimethylamino) propylamine [109-55-7]

0.5 ppm, or 2 mg/m3

 

Skin

24.

31.

N, N-Dimethyl-cyclohexylamine [98-94-2]

 

5 ppm, or 26 mg/m3

 

25.

32.

N, N-Dimethyl-ethanolamine [108-01-0]

3 ppm, or 11 mg/m3

6 ppm, or 22 mg/m3

 

26.

103.

Dimethyl terephthalate [120-61-6]

5 mg/m3

 

 

27.

18.

Dimethyl 2,3,5,6-tetracholoroterephthalate [1861-32-1]

5 mg/m3

 

 

28.

59.

Dipropylene glycol monomethyl ether acetate [88917-22-0]

100 ppm, or 776 mg/m3

150 ppm, or 1,164 mg/m3

 

29.

34.

Diquat [2764-72-9; 85-00-7; 6385-62-2]

0.5 mg/m3, or 0.1 mg/m3(R)

 

Skin

30.

35.

Enflurane [13838-16-9]

2 ppm, or 16 mg/m3

 

 

31.

42.

Ethyl-3-ethoxy propionate[763-69-9]

50 ppm, or 300 mg/m3

 

 

32.

26.

Ethylene dibromide [106-93-4]

(L)

 

Skin

33.

39.

Ethylene glycol dimethyl ether [110-71-4]

5 ppm, or 18 mg/m3

 

Skin

34.

41.

Ethylene glycol mono-n-propyl ether [2807-30-9]

25 ppm, or 110 mg/m3

 

Skin

35.

63.

Ethylene glycol mononitrate[16051-48-2]

0.05 ppm, or 0.22 mg/m3

 

Skin

36.

67.

*Ethylene oxide [75-21-8]

1 ppm, or 1.8 mg/m3

10 ppm, or 18 mg/m3

 

37.

57.

Ethyl methacrylate [97-63-2]

50 ppm

100 ppm 

 

38.

79.

Flour dust

See listing for Wheat Flour Dust (total dust)

 

 

39.

44.

Forane [26675-46-7]

2 ppm, or 15 mg/m3

 

 

40.

45.

Formaldehyde [50-00-0]

 

STEL 1 ppm, or C 1.5 ppm

 

41.

47.

Halothane [151-67-7]

2 ppm, or 16 mg/m3

 

 

42.

1.

Heptyl acetate [112-06-1]

50 ppm, or 320 mg/m3

 

 

43.

48.

Hexamethylenetetramine (HMT) [100-97-0]

 

0.35 ppm, or 2 mg/m3

 

44.

49.

Hexamethyl phosphoramide [680-31-9]

(L)

 

Skin

45.

2.

Hexyl acetate (isomeric mixture) [88230-35-7]

50 ppm, or 294 mg/m3

 

 

46.

97.

Hydrogen sulfide [7783-06-4]

10 ppm

15 ppm

 

47.

104.

Hydrogenated terphenyls2 [61788-32-7]

0.5 ppm

 

 

48a.

52a.

*Isocyanates, organic compounds

– Toluene diisocyanate (TDI) [584-84-9] [91-08-7]

0.005 ppm

C 0.02 ppm

 

48b.

52b.

*Isocyanates, organic compounds

– Methylene bisphenyl isocyanate (MDI) [101-68-8]

0.005 ppm

C 0.02 ppm

 

48c.

52c.

*Isocyanates, organic compounds

– Hexamethylene diisocyanate (HDI) [822-06-0]

0.005 ppm

C 0.02 ppm

 

48d.

52d.

*Isocyanates, organic compounds

– Isophorone diisocyanate (IPDI) [4098-71-9]

0.005 ppm

C 0.02 ppm

 

48e.

52e.

*Isocyanates, organic compounds

– Methylene bis (4-cyclohexylisocyanate) [5124-30-1]

0.005 ppm

C 0.02 ppm

 

48f.

52f.

*Isocyanates, organic compounds

– Methyl Isocyanate [624-83-9]

0.02 ppm

0.06 ppm

Skin

48g.

52g.

*Isocyanates, organic compounds

– Ethyl isocyanate [109-90-0]

0.02 ppm

0.06 ppm

Skin

48h.

52h.

*Isocyanates, organic compounds

– Phenyl isocyanate [103-71-9]

0.005 ppm

0.015 ppm

Skin

49.

53.

Isopropylaminoethanols [109-56-8] [121-93-7]

 

400 ppm, or 1,900 mg/m3

 

50.

33.

Isosorbide dinitrate [87-33-2]

0.2 mg/m3

 

Skin

51a.

77a.

*Lead [7439-92-1], elemental lead, inorganic and organic compounds of lead, as Pb

– except tetraethyl lead [78-00-2]

0.05 mg/m3

 

 

Skin (organic compounds)

51b.

77b.

*Lead [7439-92-1]

– Tetraethyl lead, as Pb [78-00-2]

0.10 mg/m3

0.30 mg/m3

 

52a.

21a.

*Lead chromate [7758-97-6]

– as Pb (see listing for lead) [7439-92-1]

0.05 mg/m3

 

 

52b.

21b.

*Lead chromate [7758-97-6]

– as Cr

0.012 mg/m3

 

 

53.

54.

Lincomycin [154-21-2]

0.1 mg/m3

 

 

54a.

51a.

Lithium hydroxide

– Anhydrous [1310-65-2]

 

1 mg/m3

 

54b.

51b.

Lithium hydroxide

– Monohydrate [1310-66-3]

 

1 mg/m3

 

55.

55.

Manganese [7439-96-5]

0.2 mg/m3

 

 

56a.

56a.

*Mercury [7439-97-6], elemental mercury, inorganic and organic compounds of mercury, as Hg

– All forms of except alkyl, as Hg

0.025 mg/m3

 

Skin

56b.

56b.

*Mercury [7439-97-6]

– Alkyl compounds of, as Hg

0.01 mg/m3

0.03 mg/m3

Skin

57.

58.

Methoxyflurane [76-38-0]

2 ppm, or 13 mg/m3

 

 

58.

60.

Methyl n-amyl ketone [110-43-0]

25 ppm, or 115 mg/m3

 

 

59.

38.

Methyl tert-butyl ether (MTBE) [1634-04-4]

40 ppm

 

 

60.

61.

Methyl n-butyl ketone [591-78-6]

1 ppm, or 4 mg/m3

 

Skin

61.

27.

4,4'-Methylene bis(2-chloroaniline) (MBOCA; MOCA®)[101-14-4]

0.0005 ppm, or 0.005 mg/m3

 

Skin

62.

25.

4,4'-Methylene dianiline [101-77-9]

0.04 mg/m3

 

Skin

63.

62.

N-Methyl-2-pyrrolidone [872-50-4]

400 mg/m3

 

 

64.

36.

Mineral Spirits

525 mg/m3

 

 

65.

98.

Nepheline syenite (total dust) [37244-96-5]

10 mg/m3

 

 

66a.

64a.

Nickel

– Elemental/metal [7440-02-0]

1 mg/m3(I)

 

 

66b.

64b.

Nickel

– Insoluble compounds, as Ni [7440-02-0]

0.2 mg/m3(I)

 

 

66c.

64c.

Nickel

– Soluble compounds, as Ni [7440-02-0]

0.1 mg/m3(I)

 

 

66d.

64d.

Nickel

– Nickel subsulfide, as Ni [12035-72-2]

0.1 mg/m3(I)

 

 

67.

8.

Nitrogen dioxide [10102-44-0]

3 ppm

5 ppm

 

68.

65.

N-Nitrosamines, including n-Nitrosodimethylamine [62-75-9]

(L)

 

Skin

69.

9.

Nitrous oxide [10024-97-2]

25 ppm, or 45 mg/m3

 

 

70.

68.

Ozone [10028-15-6]

0.1 ppm, or 0.2 mg/m3

0.3 ppm, or 0.6 mg/m3

 

71.

69.

Paraquat [4685-14-7]

0.1 mg/m3

 

 

72.

70.

Particles (Insoluble or Poorly Soluble) Not Otherwise Specified (PNOS)

10 mg/m3(I), or 3 mg/m3(R)

 

 

73.

71.

Penicillin (total dust) [1406-05-9]

0.1 mg/m3

 

 

74.

101.

Pentaerythritol tetrabenzoate [4196-86-5]

 

2 mg/m3

 

75.

23.

Petroleum coke (total dust) [64741-79-3]

3.5 mg/m3(a)

 

 

76.

72.

2-Phenoxyethanol [122-99-6]

25 ppm, or 141 mg/m3

 

Skin

77a.

76a.

Platinum[7440-06-4]

– Metal

1 mg/m3

 

 

77b.

76b.

Platinum[7440-06-4]

– Water-soluble compounds of, including chloroplatinates (as Pt)

0.002 mg/m3

 

 

78.

13.

Polychlorinated biphenyls (PCBs)2

0.05 mg/m3

 

 

79.

84.

Poultry dust (total dust)

5 mg/m3

 

 

80.

85.

1,2-Propylene glycol [57-55-6]

50 ppm (V), or 155 mg/m3(V), or 10 mg/m3(H)(b)

 

 

81.

3.

Propylene glycol monomethyl ether acetate [108-65-6]

50 ppm, or 270 mg/m3

 

 

82.

88.

Selenium hexafluoride, as Se [7783-79-1]

0.025 ppm, or 0.1 mg/m3

 

 

83.

82.

Shellac dust (total dust) [9000-59-3]

10 mg/m3

 

 

84a.

91a.

*Silica, Crystalline

– Quartz/Tripoli [14808-60-7; 1317-95-9]

0.10 mg/m3(R)

 

 

84b.

91b.

*Silica, Crystalline

– Cristobalite [14464-46-1]

0.05 mg/m3(R)

 

 

85.

90.

Silica fume [69012-64-2]

2 mg/m3(R)

 

 

86.

89.

Silica fused [60676-86-0]

0.1 mg/m3(R)

 

 

87a.

92a.

Silicon carbide [409-21-2]

– Non-fibrous

10 mg/m3(I)(E), or 3 mg/m3(R)(E)

 

 

87b.

92b.

Silicon carbide [409-21-2]

– Fibrous (including whiskers)

0.1 f/cc (R)(F)

 

 

88.

83.

Sisal dust (total dust)

2 mg/m3

 

 

89.

81.

Soap dust [68918-36-5]

5 mg/m3

 

 

90.

95.

Spectinomycin [1695-77-8]

2 mg/m3

 

 

91.

93.

Stoddard Solvent –140ºF Flash Aliphatic Solvent, Type of Stoddard Solvent

525 mg/m3

 

 

92.

96.

Styrene – monomer [100-42-5]

35 ppm

100 ppm

 

93.

94.

Sulfur dioxide [7446-09-5]

2 ppm, or 5.2 mg/m3

5 ppm, or 10.4 mg/m3

 

94a.

43a.

Synthetic Vitreous Fibres (Man Made Mineral Fibres)

– Continuous filament glass fibres

 

5 mg/m3(I), or 1 f/cc (F)

 

 

94b.

43b.

Synthetic Vitreous Fibres (Man Made Mineral Fibres)

– Glass wool fibres

1 f/cc (F)

 

 

94c.

43c.

Synthetic Vitreous Fibres (Man Made Mineral Fibres)

– Refractory ceramic fibres

0.5 f/cc (F)

 

 

94d.

43d.

Synthetic Vitreous Fibres (Man Made Mineral Fibres)

– Rock wool fibres

1 f/cc (F)

 

 

94e.

43e.

Synthetic Vitreous Fibres (Man Made Mineral Fibres)

– Slag wool fibres

1 f/cc (F)

 

 

94f.

43f.

Synthetic Vitreous Fibres (Man Made Mineral Fibres)

– Special purpose glass fibres

1 f/cc (F)

 

 

94g.

43g.

Synthetic Vitreous Fibres (Man Made Mineral Fibres)

– Synthetic Vitreous Fibres, not otherwise classified (excluding fibrous glass dust and mineral wool fibre)

 

1 f/cc (F)(c)

 

 

95.

99.

Talc [14807-96-6],containing no asbestos

2 mg/m3(R)(E), or 2 f/cc (K)

 

 

96.

100.

Tellurium hexafluoride, as Te [7783-80-4]

0.01 ppm, or 0.1 mg/m3

 

 

97.

6.

Tetrachlorophathalic anhydride [117-08-8]

0.1 mg/m3

 

 

98.

102.

Tetrachlorophenol [25167-83-3]

0.5 mg/m3

 

Skin

99.

86.

Tetrasodium pyrophosphate [7722-88-5]

5 mg/m3

 

 

100a.

37a.

Tin, as Sn [7440-31-5]

– Metal

2 mg/m3

 

 

100b.

37b.

Tin, as Sn [7440-31-5]

– Oxide and inorganic compounds, as Sn, except tin hydride

2 mg/m3

 

 

100c.

37c.

Tin, as Sn [7440-31-5]

– Organic compounds, as Sn

0.1 mg/m3

 

 

Skin (organic compounds)

101.

105.

o-Tolidine [119-93-7]

(L)

 

Skin

102.

106.

Triethanolamine [102-71-6]

0.5 ppm, or 3.1 mg/m3

 

 

103.

107.

Triethylenediamine [280-57-9]

1 ppm, or 4.6 mg/m3

 

Skin

104.

108.

Triethylenetetramine [112-24-3]

0.5 ppm, or 3 mg/m3

 

Skin

105.

109.

Trimethoxyvinylsilane [2768-02-7]

 

10 ppm, or 60 mg/m3

 

106.

75.

Trixylylphosphate [25155-23-1]

0.1 mg/m3

 

 

107.

20.

*Vinyl chloride [75-01-04]

1 ppm

 

 

108.

80.

Wheat flour dust (total dust)

3 mg/m3

 

 

109a.

78a.

Wood dust

– Certain hardwoods as beech and oak

1 mg/m3

 

 

109b.

78b.

Wood dust

 – Softwood

5 mg/m3

10 mg/m3

 

Endnotes and Abbreviations:

* Denotes a chemical agent listed in Table 1 of Ontario Regulation 490/09 (Designated Substances) made under the Act. See clause 2 (2) (a) of this Regulation.

1 Means the benzene soluble fraction of total particulate matter of the substances emitted into the atmosphere from metallurgical coke ovens including condensed vapours and solid particulates.

2 As sum of components assayed by chromatographic procedure with reference to the bulk sample.

[CAS No.] - CAS Registry Number.

f/cc - Fibres per cubic centimetre of air.

mg/m3- Milligrams of the agent per cubic metre of air.

ppm - Parts of the agent per million parts of air by volume.

Skin - Danger of cutaneous absorption.

(E) The value is for particulate matter containing no asbestos and < 1 per cent crystalline silica.

(F) Respirable fibres: length > 5µm; aspect ratio ≥3:1, as determined by the membrane filter method at 400-450 times magnification (4-mm objective), using phase-contrast illumination.

(H) Aerosol only.

(I) Inhalable fraction: means that size fraction of the airborne particulate deposited anywhere in the respiratory tract and collected during air sampling with a particle size-selective device that, (a) meets the ACGIH particle size-selective sampling criteria for airborne particulate matter; and (b) has the cut point of 100 µm at 50 per cent collection efficiency.

(K) Should not exceed 2 mg/m3respirable particulate mass.

(L) Exposure by all routes should be carefully controlled to levels as low as possible.

(R) Respirable fraction: means that size fraction of the airborne particulate deposited in the gas-exchange region of the respiratory tract and collected during air sampling with a particle size-selective device that, (a) meets the ACGIH particle size-selective sampling criteria for airborne particulate matter; and (b) has the cut point of 4 µm at 50 per cent collection efficiency.

(V) Vapour and aerosol.

(a) Provided that the total dust contains less than 0.7 per cent vanadium.

(b) For assessing the visibility in a work environment where 1,2-propylene glycol aerosol is present.

(c) A secondary limit of 5 mg/m3 (total dust) is recommended to deal with dusty operations where fibre counts are usually difficult to determine. Where both types of measurements are made simultaneously, the more restrictive limit should be used to assess the exposures.

O. Reg. 274/14, s. 2; O. Reg. 287/17, s. 3.

Schedule  Revoked:  O. Reg. 491/09, s. 8.

SCHEDULE 1
Airborne Measurement and Calculation of Exposure

1. Airborne concentrations of a biological or chemical agent are expressed as,

(a) parts of the agent per million parts of air by volume (ppm);

(b) milligrams of the agent per cubic metre of air (mg/m3); or

(c) fibres per cubic centimetre of air (f/cc).

2. Air sampling of the airborne concentrations of the biological or chemical agent is not required for the full period of a work day or a work week if the air sampling is representative of airborne concentrations of the agent likely to be present during the full period.

3. The method of air sampling, the number and volume of the samples and the method of analysis of the samples shall be determined,

(a) according to the nature of the operations or processes and the characteristics of the biological or chemical agent; and

(b) in accordance with recognized industrial hygiene practice.

4. In determining exposure to airborne concentrations of the biological or chemical agent, no regard shall be had to the wearing or use of personal protective equipment.

5. The time-weighted average exposure to an airborne biological or chemical agent in a work day or work week shall be calculated as follows:

1. The cumulative daily or weekly exposure shall be calculated using the following formula:

C1T1 + C2T2 + ... + CnTn

where,

C1 is the concentration found in an air sample, and

T1 is the total time in hours to which the worker is taken to be exposed to concentration C1 in a work day or a work week.

2. The time-weighted average exposure shall be calculated by dividing the cumulative daily exposure by eight and the cumulative weekly exposure by 40 respectively.

6. Short-term exposures to the biological or chemical agent in any 15-minute period are determined from a single sample or from a time-weighted average of sequential samples taken during that period. 

7. For mixtures of airborne chemical agents that exert an additive health effect, if analytical results of individual airborne agents are available, the following formula shall be used, subject to section 8 of this Schedule:

[(C1/L1) + (C2/L2) + + (Cn/Ln)] ꞊ E

where,

C1, C2, ... , Cn are the concentrations of the individual agents found in the air sample,

L1, L2, ... , Ln are the respective exposure limits for the agents determined in accordance with the rules set out in section 4 of the Regulation,

and the sum of these ratios, E, shall not exceed 1.

8. If the agents in a mixture of airborne chemical agents have substantially different health effects,

i. section 7 of this Schedule does not apply, and

ii. exposure to each agent shall be calculated independently.

O. Reg. 491/09, s. 9.

Note: On January 1, 2020, Schedule 1 of the Regulation is revoked and the following substituted: (See: O. Reg. 185/19, s. 7)

SCHEDULE 1
AIRBORNE MEASUREMENT AND CALCULATION OF EXPOSURE

1. Airborne concentrations of a biological or chemical agent are expressed as,

(a) parts of the agent per million parts of air by volume (ppm);

(b) milligrams of the agent per cubic metre of air (mg/m3); or

(c) fibres per cubic centimetre of air (f/cc).

2. In determining exposure to airborne concentrations of the biological or chemical agent, no regard shall be had to the wearing or using of a respirator.

3. Air sampling of the airborne concentrations of the biological or chemical agent is not required for the full period of a work day or a work week if the air sampling is representative of airborne concentrations of the agent likely to be present during the full period.

4. The average concentrations of a biological or chemical agent to which a worker is exposed shall be determined from analysis of air samples taken as being representative of the exposure of the worker to the biological or chemical agent during work operations.

5. Subject to section 6 of this Schedule, the time-weighted average exposure to an airborne biological or chemical agent in a work day or work week shall be calculated as follows:

1. The cumulative daily or weekly exposure shall be calculated using the following formula:

C1T1 + C2T2 + ... + CnTn

where,

C1 is the concentration found in an air sample, and

T1 is the total time in hours to which the worker is taken to be exposed to concentration C1 in a work day or a work week.

2. The time-weighted average exposure shall be calculated by dividing the cumulative daily exposure by eight and the cumulative weekly exposure by 40 respectively.

6. A determination of time-weighted average exposure for extended work shifts may be calculated using the methodology set out in the Guide for the Adjustment of Permissible Exposure Values for Unusual Work Schedules  (March 2015) published by Quebec’s Institut de recherche Robert-Sauvé en santé et en sécurité du travail (IRSST), using the applicable TWA set out in the Ontario Table or the ACGIH Table.

7. Short-term exposures to the biological or chemical agent in any 15-minute period are determined from a single sample or from a time-weighted average of sequential samples taken during that period.

8. For mixtures of airborne chemical agents that exert an additive health effect, if analytical results of individual airborne agents are available, the following formula shall be used, subject to section 9 of this Schedule:

[(C1/L1) + (C2/L2) + … + (Cn/Ln)] ꞊ E

where,

C1, C2, ... , Cn are the concentrations of the individual agents found in the air sample,

L1, L2, ... , Ln  are the respective exposure limits for the agents determined in accordance with the rules set out in section 4 of the Regulation,

and the sum of these ratios, E, shall not exceed 1.

9. If the agents in a mixture of airborne chemical agents have substantially different health effects,

(a) section 8 of this Schedule does not apply, and

(b) exposure to each agent shall be calculated independently.

O. Reg. 185/19, s. 7.

Note: On January 1, 2020, the Regulation is amended by adding the following Schedule: (See: O. Reg. 185/19, s. 8)

Schedule 2
assigned protection factor for respirators

Type of Respirator

Assigned Protection Factor

Air-Purifying Respirator – filtering-facepiece

10

Air-Purifying Respirator – half-facepiece

10

Air- Purifying Respirator – full-facepiece

50

Powered Air-Purifying Respirator – half-facepiece

50

Powered Air-Purifying Respirator – full-facepiece

1,000

Powered Air-Purifying Respirator – helmet/hood

25

1,000 if supported by an SWPF study

Powered Air-Purifying Respirator – loose-fitting facepiece/visor

25

Airline Respirator – continuous- flow half-facepiece

50

Airline Respirator – continuous- flow full-facepiece

1,000

Airline Respirator – continuous-flow helmet/hood

25

1,000 if supported by an SWPF study

Airline Respirator – continuous-flow loose-fitting facepiece/visor

25

Airline Respirator – pressure-demand half-facepiece

50

Airline Respirator – pressure-demand full-facepiece

1000

Self-Contained Breathing Apparatus (SCBA) – pressure-demand full-facepiece

10,000

Multi-functional SCBA/Airline Respirator

10,000

O. Reg. 185/19, s. 8.

 

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