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    • Consolidated Human Activities Database (CHAD)

    Metadata Updated: February 10, 2026

    The Consolidated Human Activity Database (CHAD) contains data obtained from human activity studies that were collected at city, state, and national levels. CHAD is intended to be an input file for exposure/intake dose modeling and/or statistical analysis.

    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=%7B25B6EC2E-51D5-4691-A4C6-8249268DBEB3%7D
    https://edg.epa.gov/metadata/catalog/search/resource/details.page?uuid=%7B25B6EC2E-51D5-4691-A4C6-8249268DBEB3%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 Research and Development (ORD) - National Exposure Research Laboratory (NERL)
    Maintainer
    Identifier {25B6EC2E-51D5-4691-A4C6-8249268DBEB3}
    Data First Published 2014-01-01
    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 abe67852-ce8f-4d32-9658-5283e275af39
    Harvest Source Id 9c1c2b5b-7925-4ca2-a663-ca2131653db1
    Harvest Source Title EPA Non Geo Repository
    Homepage URL https://edg.epa.gov/metadata/catalog/search/resource/details.page?uuid=%7B25B6EC2E-51D5-4691-A4C6-8249268DBEB3%7D
    License https://edg.epa.gov/EPA_Data_License.html
    Old Spatial -180.0,18.0,-66.0,72.0
    Program Code 020:072
    Related Documents https://edg.epa.gov/metadata/rest/document?id=%7B25B6EC2E-51D5-4691-A4C6-8249268DBEB3%7D, https://edg.epa.gov/metadata/catalog/search/resource/details.page?uuid=%7B25B6EC2E-51D5-4691-A4C6-8249268DBEB3%7D
    Source Datajson Identifier True
    Source Hash a99273f16c78e6d4c89b63cd56ac08ad6d5605adc2f74a1410b806bf8eb54aee
    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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