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
Ministry contact: Environment, Conservation and Parks

Additional information

Tags
Geographic coverage
Ontario
Last Validated Date
January 18, 2024
Update frequency
Yearly

Air Quality Stations

Learn more about accessing data using different formats.

Date range: January 1, 2000 - December 31, 2022

  • CSV
    Air Quality Stations (2022) English

    Last Updated: January 18, 2024

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  • CSV
    Ambient Air Network Notes English

    Last Updated: January 18, 2024

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  • ZIP
    Access to Air quality stations (2022) English and French

    Last Updated: January 18, 2024

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  • ZIP
    Access to Air quality stations (2021) English and French

    Last Updated: December 16, 2022

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Supporting Files

  • TXT
    README English and French

    Last Updated: January 18, 2024

    These are definitions of abbreviations used in the data.

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  • PDF
    Metadata English

    Last Updated: January 18, 2024

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  • PDF
    Metadata French

    Last Updated: January 18, 2024

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