Description

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: http://www.airqualityontario.com/

Resources

Name	Format	Description	Link
Original metadata (https://data.ontario.ca)	HTML		https://data.ontario.ca/dataset/e5018406-cb90-4ded-a826-3e756402a2db
Original metadata (https://data.ontario.ca/fr)	HTML		https://data.ontario.ca/fr/dataset/e5018406-cb90-4ded-a826-3e756402a2db
Carbon monoxide (CO) statistics	xlsx		https://files.ontario.ca/moe_mapping/downloads/1Air/Statistics/CO_Data_1995-2025.xlsx
Nitrogen dioxide (NO2) statistics	xlsx		https://files.ontario.ca/moe_mapping/downloads/1Air/Statistics/NO2_Data_1995-2025.xlsx
Nitric oxide (NO) statistics	xlsx		https://files.ontario.ca/moe_mapping/downloads/1Air/Statistics/NO_Data_1995-2025.xlsx
Nitrogen oxides (NOX) statistics	xlsx		https://files.ontario.ca/moe_mapping/downloads/1Air/Statistics/NOX_Data_1995-2025.xlsx
Ozone (O3) statistics	xlsx		https://files.ontario.ca/moe_mapping/downloads/1Air/Statistics/O3_Data_1995-2025.xlsx
Fine particulate matter (PM25) statistics	xlsx		https://files.ontario.ca/moe_mapping/downloads/1Air/Statistics/PM25_Data_2003-2025.xlsx
README	TXT		https://files.ontario.ca/moe_mapping/downloads/1Air/Statistics/README_2025.txt
Sulphur dioxide (SO2) statistics	xlsx		https://files.ontario.ca/moe_mapping/downloads/1Air/Statistics/SO2_Data_1995-2025.xlsx
Total reduced Sulphur (TRS) statistics	xlsx		https://files.ontario.ca/moe_mapping/downloads/1Air/Statistics/TRS_Data_1995-2025.xlsx
Metadata	PDF		https://files.ontario.ca/moe_mapping/downloads/metadata/opendata/Air_Pollutant_Stats_metadata-EN.pdf
Metadata	PDF		https://files.ontario.ca/moe_mapping/downloads/metadata/opendata/Air_Pollutant_Stats_metadata-FR.pdf

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