Los Angeles Air Still Among Nation’s Dirtiest

LOS ANGELES – SEPTEMBER 11: Downtown highrise buildings are shown cloaked in dirty air shortly after sunrise September 11, 2002 in Los Angeles, California. Although air quality in Los Angeles has improved in recent decades, smog levels remain among the nation’s worst. Numerous wildfires in the region have also contributed to Los Angeles’ air pollution problem. (Photo by David McNew/Getty Images)

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