LA Air Quality

Despite improvements over the years, the Los Angeles area remains the most ozone-polluted region in the country, according to a report released Tuesday by the American Lung Association.
The group's 10th annual national report also found that 38 California counties, including Los Angeles, received a failing grade for air quality - 12 more than last year.

Among other factors, the bad grades reflect a more stringent national ozone standard implemented in 2008, said Bonnie Holmes-Gen, senior policy director for the American Lung Association.

"California has had an enormous population growth and vehicle traffic," Holmes-Gen said. "Over the last 20 years, our population has doubled, our use of vehicles has grown and all forms of transportation, such as freight movement, diesel trucks, ships at the port and locomotion, also have increased."

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