Los Angeles Air quality: Los Angeles Remains Among The US's Most Polluted Cities

04/27/2011 11:57 am ET | Updated Jun 27, 2011

Smog and soot levels have dropped significantly in Southern California over the last decade, but the Los Angeles region still has the highest levels of ozone nationwide, violating federal health standards an average of 137 days a year.

The city ranks second in the country, behind Bakersfield, for the highest year-round levels of toxic particles or soot, and fourth in the nation for the number of short-term spikes in soot pollution.

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