An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Outdoor Air Quality Data

Air Data - Daily Air Quality Tracker

Compare daily AQI values for any year with the 20-year high and low (2000-2019) and the five-year average (2015-2019).  You can also generate a one-page PDF report for 2020.

More information: The most recent AQI values are based on available ozone and PM2.5 data from AirNow (see "Use of AirNow Data" info box).  The 20-year high/low backdrop is based on AQS data from 2000-2019.  It shows the range of the highest and lowest daily max AQI values on each date.  The 5-year average is based on AQS data from 2015-2019.  It  shows the average of daily max AQI values on each date.

Tip: Hover over lines to display data points. Download the data using the link below the charts.

  1.     -- or --


Top of Page