Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Skip to content

Try the next-generation Data Catalog at catalog-beta.data.gov and help shape it with your feedback.

  • Feedback

    • Web page with Air Quality System (AQS) ambient observation files

    Metadata Updated: February 10, 2026

    Ambient concentrations of most requested pollutants from the national ambient air quality monitoring networks stored in the Air Quality System (AQS).

    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=%7B15B86480-7A2D-4FBD-9258-090DA358C4F0%7D
    https://edg.epa.gov/metadata/catalog/search/resource/details.page?uuid=%7B15B86480-7A2D-4FBD-9258-090DA358C4F0%7D

    Dates

    Metadata Created Date January 30, 2026
    Metadata Updated Date February 10, 2026
    Data Update Frequency R/P1W

    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 15B86480-7A2D-4FBD-9258-090DA358C4F0
    Data First Published 2014-01-01
    Language en-US
    Data Last Modified 2014-01-01
    Public Access Level public
    Data Update Frequency R/P1W
    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
    Data Dictionary https://www.epa.gov/aqs/obtaining-aqs-data
    Harvest Object Id c533a842-0bb9-407e-9044-b24cd8d4c7f9
    Harvest Source Id 9c1c2b5b-7925-4ca2-a663-ca2131653db1
    Harvest Source Title EPA Non Geo Repository
    License https://edg.epa.gov/EPA_Data_License.htm
    Old Spatial -180.0,18.0,-66.0,72.0
    Program Code 020:072
    Related Documents https://edg.epa.gov/metadata/rest/document?id=%7B15B86480-7A2D-4FBD-9258-090DA358C4F0%7D, https://edg.epa.gov/metadata/catalog/search/resource/details.page?uuid=%7B15B86480-7A2D-4FBD-9258-090DA358C4F0%7D
    Source Datajson Identifier True
    Source Hash 24635fe29d10547ef13796b393e2b6f50ac2ca4673f3547f62e414527acc08e5
    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}
    Temporal 1993-01/2009-12

    Didn't find what you're looking for? Suggest a dataset here.