L.A., Central Valley have worst air quality, American Lung Assn. says

The annual air pollution rankings, being released Wednesday by the American Lung Assn., were dominated by the Los Angeles Basin and California's Central Valley, which despite vast improvements over the last few decades still have the nation's highest levels of ozone and fine particle pollution. http://www.latimes.com/science/la-me-0430-air-pollution-20140430,0,2614465.story#ixzz30MzECMow Article courtesy of The Los Angeles Times by Tony Barboza