07.11.2011 - America's 20 dirtiest cities
California has gone to extremes to improve the stateís air quality, pushing out coal-fired power plants and implementing the strictest auto emissions standards in the nation. L.A.ís persistent smog layer may be a shadow of its former self, but it hasnít been enough. Lots of people and too many cars means California still has seven big cities that rank among the 20 most polluted in the nation. L.A. ranks No. 2 on our list of Americaís Dirtiest Cities, and San Diego is no. 9, but some of the worst air in the country is in smaller cities in the San Joaquin Valley, where a ring of mountains traps a stagnant stew of ozone and particulate matter...............................................Full Article: Source
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