Level of Health Concern (Air Quality Condition)
Unhealthy for members of sensitive groups†
* The AQI is based on the levels of 5 pollutants regulated by the U.S. Environmental Protection Agency under the Clean Air Act. The pollutants are ozone, particulate matter, carbon monoxide, sulfur dioxide, and nitrogen dioxide.
† Members of sensitive groups include people with lung or heart disease, children, and older adults.
AQI = air quality index.
Adapted from US Environmental Protection Agency: Air quality index: A guide to air quality and your health. Research Triangle Park, NC, 2009.