Download Daily Data
Ozone AQI Breakpoints
The AQI breakpoints for ozone were updated on June 21, 2016 to be consistent with the 2015 ozone standards. This update applies to all historical data as well. For more information, see the table on page 2 of the Updates to the Air Quality Index (AQI) for Ozone and Ozone Monitoring Requirements (PDF).
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.
Note: State-level queries can take a minute or longer to complete.