These are the air quality topics that we believe might be of most interest to you as a government official or employee in Illinois. For even more information, visit
our main air quality page, as well as our
forms, permits, and fees page.
Vehicle Emissions Testing
Ambient Air Monitoring
Planning - CAIR-Nox
Outdoor Air Quality Data, including Air Quality Index, ozone highs, and PM2.5 averages.
Air Quality (main page)
Forms, permits, and fees