sábado, 30 de abril de 2011

Americas 10 Best and 10 Worst Cities for Air Pollution

Where are people choking on smog, and where can they stay healthy? The American Lung Association has answers.

Source:
http://www.theatlantic.com/life/archive/2011/04/americas-10-best-and-10-worst-cities-for-air-pollution/237974/