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Metropolitan Los Angeles, extending to Riverside and Long Beach, remains the smoggiest city in the United States, with an average of more than 140 days a year of dangerous ozone levels, the American Lung Assn. reported in its annual assessment. See http://www.stateoftheair.org/.
All of the nation's 10 smoggiest counties are in California, with San Bernardino, Riverside, Kern, Tulare and Los Angeles leading the pack. And the State's cities and counties, with their ports, refineries, power plants and crowded freeways, rank near the top for particle pollution.