The Los Angeles-Long Beach-Riverside area has the worst smog levels in the nation but has dropped in particle pollution, according to the American Lung Association's annual air-quality report released Wednesday.

The region dropped to No. 4 in short-term particle pollution and No. 3 in annual particle pollution. Meanwhile, the Bakersfield-Delano area ranked as No. 1 in both short-term and annual particle pollution.
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