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Air Emissions Inventory and Reporting

Each year facilities throughout the state that emit air pollutants are required to report their emissions to the DNR. These pages provide instructions for reporting emissions through the Air Reporting System (ARS), as well as information on air pollutants and data on historical emissions.

DNR Switchboard

Report your emissions with the DNR Switchboard.

Historical Emissions Data

See how Wisconsin air emissions have changed over time.

Electronic Reporting Tutorials

Learn how to use the Air Reporting System (ARS) to report facility air emissions.

Air Quality

Learn about air quality in Wisconsin.
Air Quality

Air Permits

Learn about Wisconsin's air permit process.
Air Permits

Wisconsin Emissions Reduction Credit (ERC) Registry

The ERC Registry assists facilities looking for emissions offsets to meet NNSR permitting requirements.
Wisconsin Emissions Reduction Credit (ERC) Registry

Air Program Contacts

Our organization chart, staff lists and contacts by topic.
Air Program Contacts