Pollution and Air Quality

Environment Canada

Geoconnections - Canadian Geospatial Data Infrastructure
A searchable database of Canadian and international data sources. Not all sources in the database are available for download.

Air Quality Ontario

AIRNow Air Quality Maps

Environmental Protection Agency (U.S.)


National Oceanic and Atmospheric Administration

Center for International Earth Science Information Network

World Ozone and Ultraviolet Radiation Data Centre (WOUDC) (Environment Canada)