Air quality stations

The air monitoring stations measure up to 6 common pollutants like:

  • ground-level ozone
  • fine particulate matter
  • nitrogen dioxide
  • carbon monoxide
  • sulphur dioxide
  • total reduced sulphur compounds

The Ministry of the Environment, Conservation and Parks continually monitors air quality across Ontario. We use this information to:

  • inform the public about outdoor ambient air quality through the Air Quality Index (AQI) and Smog Advisory program
  • assess Ontario's air quality and evaluate long-term trends
  • identify areas where pollutant levels are exceeded
  • identify the origins of pollutants
  • develop air policy
  • provide quantitative measurements to reduce specific pollution sources
  • determine the significance of pollutants from long-range transports and their effects
  • provide air quality researchers with data to link environmental and human health effects to air quality

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.]

2000 - 2020

Supporting Files

Additional Info

Field Value
Geographic coverage Ontario
Geography Breakdown None
Source URL/Address
Author Email
Maintainer branch
Last Validated Date 2021-12-10
Update frequency Yearly
Access instructions