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    • Nonattainment Area - Particulate Matter - 2.5 Annual (1997 Standard)

    Metadata Updated: February 3, 2026

    The Nonattainment Area - Particulate Matter-2.5 Annual (1997) dataset was updated on January 31, 2026 by the Environmental Protection Agency (EPA) and is part of the U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics (BTS) National Transportation Atlas Database (NTAD). This dataset provides detailed information about areas identified in the U.S. where annual particulate matter (PM2.5) levels have not met the National Ambient Air Quality Standards (NAAQS) established in 1997 for particulate matter (PM2.5) and have been designated "nonattainment areas (NAA)". The 1997 Primary Annual PM-2.5 NAAQS is revoked in attainment and maintenance areas for that NAAQS. For additional information see the PM-2.5 NAAQS SIP Requirements Final Rule, effective October 24, 2016 (https://www.govinfo.gov/link/fr/81/58009). These data are weekly from an OAQPS internal database. However, that does not necessarily mean the data have changed. For more information about this non-attainment area, please see the website https://www.epa.gov/green-book/green-book-pm-25-1997-area-information. A data dictionary, or other source of attribute information, is accessible at https://doi.org/10.21949/1529068

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Date February 2, 2026
    Metadata Created Date August 3, 2024
    Metadata Updated Date February 3, 2026
    Reference Date(s) July 1, 2004 (creation), January 31, 2026 (revision)
    Frequency Of Update weekly

    Metadata Source

    Harvested from National Transportation Atlas Database (NTAD) Metadata

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Date February 2, 2026
    Metadata Created Date August 3, 2024
    Metadata Updated Date February 3, 2026
    Reference Date(s) July 1, 2004 (creation), January 31, 2026 (revision)
    Responsible Party Environmental Protection Agency (EPA) (Point of Contact)
    Contact Email
    Guid Nonattainment Area - Particulate Matter - 2.5 Annual (1997 Standard)
    Access Constraints Access Constraints: unrestricted
    Bbox East Long -71.8566403472533
    Bbox North Lat 48.4750797101799
    Bbox South Lat 32.6605965914422
    Bbox West Long -121.585953038079
    Coupled Resource
    Frequency Of Update weekly
    Harvest Object Id afbc379a-75b0-4b7b-bf02-61af9733b8aa
    Harvest Source Id ee45e034-47c1-4a61-a3ec-de75031e6865
    Harvest Source Title National Transportation Atlas Database (NTAD) Metadata
    Licence This NTAD dataset is a work of the United States government as defined in 17 U.S.C. § 101 and as such are not protected by any U.S. copyrights. This work is available for unrestricted public use.
    Lineage
    Metadata Language eng; USA
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-121.585953038079, 32.6605965914422], [-71.8566403472533, 32.6605965914422], [-71.8566403472533, 48.4750797101799], [-121.585953038079, 48.4750797101799], [-121.585953038079, 32.6605965914422]]]}
    Progress onGoing
    Spatial Data Service Type
    Spatial Reference System 3857
    Spatial Harvester True

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