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    • Regional Air Quality Data

    Metadata Updated: February 10, 2026

    This asset provides data on regional air quality, including trace level SO2, nitric acid, ozone, carbon monoxide, and NOy; and particulate sulfate, nitrate, and ammonium from 1989 to present. Precipitation and meteorology are provided from 1989 to 2011.

    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/rest/document?id=%7BDE68A445-C389-4C5C-AAC7-D15395BC12D1%7D
    https://edg.epa.gov/metadata/catalog/search/resource/details.page?uuid=%7BDE68A445-C389-4C5C-AAC7-D15395BC12D1%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 DE68A445-C389-4C5C-AAC7-D15395BC12D1
    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 210587e7-c1e0-4057-862d-b84fb75d69cd
    Harvest Source Id 9c1c2b5b-7925-4ca2-a663-ca2131653db1
    Harvest Source Title EPA Non Geo Repository
    Homepage URL https://www.epa.gov/castnet
    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/rest/document?id=%7BDE68A445-C389-4C5C-AAC7-D15395BC12D1%7D, https://edg.epa.gov/metadata/catalog/search/resource/details.page?uuid=%7BDE68A445-C389-4C5C-AAC7-D15395BC12D1%7D
    Source Datajson Identifier True
    Source Hash ae7e968d096fe6807ad79cd6c71ab270fc9b713cb6844c727ac6811f9d1c5197
    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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