BreezoMeter uses a hybrid index that is based on the AirNow’s NowCast and U.S. AQI
We take the average of each pollutant type as described below.
We convert average pollutant concentrations to an AQI for each pollutant.
The final AQI is determined by taking the worst AQI among all pollutants. The worst pollutant being the dominant pollutant.
EPA Nowcast AQI (US) represents air quality levels according to the following health categories:
Good air quality
0 to 50
Moderate air quality
51 to 100
Unhealthy air quality for sensitive groups
101 to 150
Unhealthy air quality
151 to 200
Very unhealthy air quality
201 to 300
Hazardous air quality
301 to 500
1h or 8h avg.
1h or 24h avg.
The chart displays the pollutants that are part of the The following chart displays the pollutants that are part of the EPA Nowcast AQI (US) calculation and the timeframe taken to average each pollutant type.:
Explore the local air quality indexes BreezoMeter uses in various countries.