Air Quality System (AQS)

  • Air Quality System

    AQS is EPA's repository of ambient air quality data that assists in air quality assessments, designations, modeling for permit review and prepare reports for Congress as mandated by the Clean Air Act.

The Air Quality System (AQS) contains ambient air pollution data collected by EPA, state, local, and tribal air pollution control agencies from over thousands of monitors.  AQS also contains meteorological data, descriptive information about each monitoring station (including its geographic location and its operator), and data quality assurance/quality control information.

Tools to Upload AQS Data
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Last updated on March 27, 2025