Annual Air Pollutant Statistics

This dataset provides a summary of annual air pollution statistics from 1995 to the current available year for six air pollutants:

  • Carbon Monoxide
  • Oxides of Nitrogen (NO, NO2, NOx)
  • Ozone
  • Fine Particulate Matter (PM2.5)
  • Sulphur Dioxide
  • Total Reduced Sulphur

The annual statistics include percentiles, mean, maximums and also indicate the number of times an air monitoring station exceeded an Ontario annual ambient air quality criteria, where applicable. This information is also available in the annual Air Quality in Ontario Reports. The hourly air pollutant concentration data is posted in near real time on the Air Quality Ontario website:

For more information


Data Available

The data described here is available for you to use. [Learn more]
[See the licence for how you're allowed to use this data.]

2003 - 2020

1995 - 2020

Supporting Files

Additional Info

Field Value
Geographic coverage
Geography Breakdown None
Source URL/Address
Author Email
Maintainer branch Environmental Monitoring and Reporting Branch
Last Validated Date 2021-12-13
Update frequency Yearly
Access instructions