10-year trend of 8-hour O₃ CAAQS metrics in Ontario
10-year trend of 8-hour O₃ CAAQS metrics in Ontario| Year | 8-hour O₃ CAAQS Metric |
|---|
| 2011 | 67 ppb |
| 2012 | 70 ppb |
| 2013 | 68 ppb |
| 2014 | 67 ppb |
| 2015 | 64 ppb |
| 2016 | 65 ppb |
| 2017 | 66 ppb |
| 2018 | 66 ppb |
| 2019 | 63 ppb |
| 2020 | 63 ppb |