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Air Quality System (AQS)

Published by U.S. EPA Office of Air and Radiation (OAR) - Office of State Air Partnerships (OSAP) | U.S. Environmental Protection Agency | Catalog Last Checked: August 01, 2026 at 03:29 AM | Dataset Last Updated: January 01, 2014
The Air Quality System (AQS) database contains measurements of air pollutant concentrations from throughout the United States and its territories. The measurements include both criteria air pollutants and hazardous air pollutants.

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  • Resource 2

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