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 Files (slice {"file": url}): - Air Quality Stations (2022) (csv): https://files.ontario.ca/moe_mapping/downloads/1Air/2000-2022_Ambient_Air_Network.csv - Ambient Air Network Notes (2022) (csv): https://files.ontario.ca/moe_mapping/downloads/1Air/2000-2022_Ambient_Air_Network_Notes.csv - Air Quality Stations (2023) (csv): https://files.ontario.ca/moe_mapping/downloads/1Air/Air_Quality_Network/2000-2023_Ambient_Air_Network.csv - Air Quality Stations (2024) (csv): https://files.ontario.ca/moe_mapping/downloads/1Air/Air_Quality_Network/2000-2024_Ambient_Air_Network.csv - Ambient Air Network Notes (2024) (csv): https://files.ontario.ca/moe_mapping/downloads/1Air/Air_Quality_Network/2000-2024_Ambient_Air_Network_Notes.csv - Ambient Air Network Notes (2023) (csv): https://files.ontario.ca/moe_mapping/downloads/1Air/Air_Quality_Network/2000-2023_Ambient_Air_Network_Notes.csv - Air Quality Stations (2025) (csv): https://files.ontario.ca/moe_mapping/downloads/1Air/Air_Quality_Network/2000-2025_Ambient_Air_Network.csv - Ambient Air Network Notes (2025) (csv): https://files.ontario.ca/moe_mapping/downloads/1Air/Air_Quality_Network/2000-2025_Ambient_Air_Network_Notes.csv

Cite as: Government of Ontario | Gouvernement de l'Ontario. Air Quality Stations. https://open.canada.ca/data/en/dataset/ecc29fa2-e235-4974-a86d-38da36e6238b