Learn about air quality (including agricultural burning) from the Department of Ecology's Air Quality Program. Read the 2000-2002 AirQuality Trends Report (.pdf format). Visit the Ambient Air Quality Data Page to look at air quality monitors around Washington.
Learn about water quality from the Department of Ecology's Water Quality Program. Don't miss Watershed Basins of Washington which includes links to water quality studies, monitoring, etc. for each watershed.
The State of Washington Water Research Center studies water-related issues.
The GAP Home Page has maps on land cover and bird, mammal and reptile/amphibian distributions in the state.
The Department of Natural Resources manages state-owned lands, helps protect sensitive species, and fights wildfires.