Description

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

Resources

Name	Format	Description	Link
Original metadata (https://data.ontario.ca)	HTML		https://data.ontario.ca/dataset/ecc29fa2-e235-4974-a86d-38da36e6238b
Original metadata (https://data.ontario.ca/fr)	HTML		https://data.ontario.ca/fr/dataset/ecc29fa2-e235-4974-a86d-38da36e6238b
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
Access to Air quality stations (2021)	ZIP		https://files.ontario.ca/moe_mapping/downloads/1Air/Air_Network_2021.zip
Access to Air quality stations (2022)	ZIP		https://files.ontario.ca/moe_mapping/downloads/1Air/Air_Network_2022.zip
README	TXT		https://files.ontario.ca/moe_mapping/downloads/1Air/Air_Network_Readme_EN_FR.txt
Air Quality Stations (2023)	CSV		https://files.ontario.ca/moe_mapping/downloads/1Air/Air_Quality_Network/2000-2023_Ambient_Air_Network.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
Access to Air quality stations (2023)	ZIP		https://files.ontario.ca/moe_mapping/downloads/1Air/Air_Quality_Network/2000-2023_Ambient_Air_Network.zip
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
Access to Air quality stations (2024)	ZIP		https://files.ontario.ca/moe_mapping/downloads/1Air/Air_Quality_Network/2000-2024_Ambient_Air_Network.zip
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
Metadata	PDF		https://files.ontario.ca/moe_mapping/downloads/metadata/opendata/Air_Quality_Stations-metadata_EN.pdf
Metadata	PDF		https://files.ontario.ca/moe_mapping/downloads/metadata/opendata/Air_Quality_Stations-metadata_FR.pdf

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