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    • Air Quality System (AQS)

    Metadata Updated: February 10, 2026

    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.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: See this page for license information.

    Downloads & Resources

    References

    https://edg.epa.gov/metadata/catalog/search/resource/details.page?uuid=%7B39529785-E7E6-4C46-BE1A-FF37C4D099AA%7D
    https://edg.epa.gov/metadata/rest/document?id=%7B39529785-E7E6-4C46-BE1A-FF37C4D099AA%7D

    Dates

    Metadata Created Date January 30, 2026
    Metadata Updated Date February 10, 2026
    Data Update Frequency irregular

    Metadata Source

    Harvested from EPA Non Geo Repository

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date January 30, 2026
    Metadata Updated Date February 10, 2026
    Publisher U.S. EPA Office of Air and Radiation (OAR) - Office of Air Quality Planning and Standards (OAQPS)
    Maintainer
    Identifier 39529785-E7E6-4C46-BE1A-FF37C4D099AA
    Data First Published 2014-01-01
    Language en-US
    Data Last Modified 2014-01-01
    Public Access Level public
    Data Update Frequency irregular
    Bureau Code 020:00
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://edg.epa.gov/data/nongeo_data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id be1ce48f-f0b0-4b44-bc7d-faec79dfbf85
    Harvest Source Id 9c1c2b5b-7925-4ca2-a663-ca2131653db1
    Harvest Source Title EPA Non Geo Repository
    Homepage URL https://www.epa.gov/aqs
    License https://edg.epa.gov/EPA_Data_License.htm
    Old Spatial -180.0,18.0,-66.0,72.0
    Program Code 020:094
    Related Documents https://edg.epa.gov/metadata/catalog/search/resource/details.page?uuid=%7B39529785-E7E6-4C46-BE1A-FF37C4D099AA%7D, https://edg.epa.gov/metadata/rest/document?id=%7B39529785-E7E6-4C46-BE1A-FF37C4D099AA%7D
    Source Datajson Identifier True
    Source Hash f9a4bb57d885da2843f6f563085e8644f7a45510b920b8df374f05e7b0999179
    Source Schema Version 1.1
    Spatial {"type": "Polygon", "coordinates": -180.0, 18.0, -180.0, 72.0, -66.0, 72.0, -66.0, 18.0, -180.0, 18.0}

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