An official website of the United States government.

Due to a lapse in appropriations, EPA websites will not be regularly updated. In the event of an environmental emergency imminently threatening the safety of human life or where necessary to protect certain property, the EPA website will be updated with appropriate information. Please note that all information on the EPA website may not be up to date, and transactions and inquiries submitted to the EPA website may not be processed or responded to until appropriations are enacted.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Outdoor Air Quality Data

Air Data - AQI Plot

Compare AQI values for multiple pollutants for a specific location and time period. This tool displays an entire year of AQI values - two pollutants at a time - and is useful for seeing how the number of unhealthy days can vary throughout the year for each pollutant.


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