Extracted Data From: EPA Outdoor Air Quality Data (AQS)

This submission includes publicly available data extracted in its original form. Please reference the Related Publication listed here for source and citation information: https://19january2021snapshot.epa.gov/sites/static/files/2015-05/documents/aceappendixb_airqualitysystem.pdf Condensed from the original EPA webpage, based on the data that was extracted: This page contains large files of data intended for use by people who understand the EPA ambient air quality monitoring program and data. Some contain data summarized on an annual basis (annual summary files) and some contain data summarized on a daily basis (daily summary). All but the annual summary have data files grouped by parameter: Criteria Gases; Particulates; Toxics, Ozone Precursors, and Lead. The annual summary files are small enough to include all data in one file. The files are all comma separated text with a header. Each aggregate level has a different format. EPA updates these files twice per year; in the spring and fall (late May and November). Keep in mind, data collection agencies have up to 6 months to report their data. [Given the time of extraction in January 2025, the last six months of 2024 are not finalized.] If you have questions about the source data please contact the EPA Air Quality System (AQS) team at [e-mail]. For metadata questions, contact CAFE above.