Data Source Description
Sources: AirNow, U.S. Drought Monitor
AirNow is a one-stop source for air quality data. AirNow reports air quality using the official U.S. Air Quality Index (AQI), a color-coded index designed to communicate whether air quality is healthy or unhealthy.
The AQI is calculated for four major air pollutants regulated by the Clean Air Act: ground level ozone, particle pollution, carbon monoxide, and sulfur dioxide. For each of these pollutants, EPA has established national air quality standards to protect public health. Of these, ground-level ozone and airborne particles are the two pollutants that pose the greatest threat to human health.
AirNow is a partnership of the EPA, NOAA, National Park Service, NASA, Centers for Disease Control and Prevention, and tribal, state, and local air quality agencies.
U.S. Drought Monitor (USDM) data from the National Drought Mitigation Center were available in a GIS format.