http://mashable.com/2007/11/26/epa-google-earth/
The U.S. Environmental Protection Agency has created a Google Earth map mashup that shows air quality across the nation. Get started here. There’s even a 3-D map overlay that lets you view the level of air pollutants that are coming from specific businesses. You can see this if you tilt your map, and it’s most useful when used with 3D map renderings, complete with business buildings and all.
