AIRNow is a cross-agency U.S. government web site that provides information and forecasts of air quality across the country. The organization's home page features news articles, information on the Air Quality Index (AQI), and highlighted forecasts for areas with AQIs of special concern. An interactive map shows weather systems, winds, and areas where air quality is likely to be compromised by ozone, particulates, ultraviolet radiation, or other pollutants, with links to current conditions, forecasts, and webcams for selected cities. There are also links to educational materials on air quality for younger students, interactive features and visual materials for older students, and curriculum materials for teachers. Other resources include information on AQI for health providers, older adults, and TV weathercasters; information on air quality and personal health, smoke from fires, and links to air quality information from other countries.

The AQI tells the user the quality of the air in any region, state or local major metropolitan area and whether it will affect your health. EPA, state, and local agencies work together to report current and forecast conditions for ozone and particle pollution. AIRNow describes current conditions and also forecasts next-day air quality. It also allows the viewer to visualize the changing conditions hourly from the previous 24-hour period.