The maps are of the US only and they show the location of air pollution monitoring sites, major sources of air pollution and areas where air pollution levels exceed health-based air pollution EPA standards. The maps show criteria pollutants - these are the six air pollutants for which the EPA has established national standards.
Maps are ready to view and are generated each week.
They are intended to provide overview information only. Alternatively it is possible to create your own map. This site provides environmental engineering information and resources. The Academy aims to improve the standard of environmental engineering, and information is given about environmental engineering experts. There are also details of events, technology, membership and careers, plus a link to the Environmental Engineering Bookstore.