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).
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.