The 10 Most Polluted Cities in America

Modesto is in Californias Central Valley, one of the most productive agricultural areas in the U.S., but also one of the most polluted. High ozone days remain a major problem in Modesto, where a combination of geography and emissions from cars and industrial agriculture add up. A little less than 10% of the population has

Carl Skaggs

Modesto is in California’s Central Valley, one of the most productive agricultural areas in the U.S., but also one of the most polluted. High ozone days remain a major problem in Modesto, where a combination of geography and emissions from cars and industrial agriculture add up. A little less than 10% of the population has asthma.

Next #4 (tie): Los Angeles-Long Beach-Riverside, CA

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