Monitor Values Report - Hazardous Air Pollutants

Ambient Monitoring Archive

This report uses data from AQS. EPA also maintains a separate database of air toxics monitored data, the Ambient Monitoring Archive, which consists of data from AQS and other monitoring networks not reporting to AQS. A more complete description of the sources of the data and the quality assurance procedures applied to the data is available in this technical report. The data archive is typically updated on an annual basis.

This report displays hazardous air pollutant summary data for individual monitoring sites. Read more about what's in this report.

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Last updated on March 28, 2025