Download daily data for a specific location and time period. This tool queries daily air quality summary statistics for the criteria pollutants by monitor. You can get data for specific monitors or all monitors in a city, county, or state.  

Timeliness of data - The daily summaries come direcly from the AQS Data Mart which contains ambient air pollution data collected by EPA, state, local, and tribal air pollution control agencies.  Most data in AQS is required to be submitted by the end of the calendar quarter after the quarter in which it was collected. However, AQS is updated practically every day as reporting agencies have data ready to submit. A key milestone in reporting is May 1^st, by which all data for the prior year should be complete and correct.

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