Air Pollution In Cities As Dangerous For Lungs As Smoking 20 Cigarettes A Day, Study Finds

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The study, published in JAMA, looked at the health effects of breathing in various pollutants, including ground-level ozone, the main component of smog. It involved nearly 7,000 adults living in Chicago, Los Angeles, Baltimore, St. Paul, Minn., New York City and Winston-Salem, N.C. Environmental news comes from Louisiana, Missouri, Arizona and New Jersey, as well.