Air Quality Index
Air Quality Forecast
Monitoring Air Quality
- Locations measuring the predominant air pollutant this hour
- Locations reporting other pollutants
About the Air Quality Index (AQI)
The AQI is an index for reporting air quality. It tells you how clean or polluted your air is, and what associated health effects might be a concern for you. Think of the AQI as a yardstick that runs from 0 to 500. The higher the AQI value, the greater the level of air pollution and the greater the health concern.
An AQI value of 100 generally corresponds to the national air quality standard for the pollutant, which is the level EPA has set to protect public health. To make it easier to understand, the AQI is divided into six categories:
Good – Air quality is considered satisfactory, and air pollution poses little or no risk.Numeric Value: 0-50
Moderate – Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.Numeric Value: 51-100
Unhealthy for Sensitive Groups – Members of sensitive groups may experience health effects. The general public is not likely to be affected.Numeric Value: 101-150
Unhealthy – Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.Numeric Value: 151-200
Very Unhealthy – Health alert: everyone may experience more serious health effects.Numeric Value: 201-300
Hazardous – Health warnings of emergency conditions. The entire population is more likely to be affected.Numeric Value: 301+
The Current Air Quality reflects the predominant air pollutant (either PM2.5, PM10, or Ozone*) with the highest reading in the monitoring network. *Ozone is only measured during ozone season, May-September.
Note: Values above 500 are considered Beyond the AQI. Follow recommendations for the “Hazardous category.” Additional information on reducing exposure to extremely high levels of particle pollution is available.