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Smog is common not only in Los Angeles but also in cities across the country. New research finds that long-term exposure to high levels of air pollution may be as harmful to the lungs as smoking. Mario Tama/Getty Images hide caption

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Mario Tama/Getty Images

Air Pollution May Be As Harmful To Your Lungs As Smoking Cigarettes, Study Finds

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An analysis of air quality and childhood asthma in Los Angeles found that kids' health improved when smog declined. Frederic J. Brown/AFP/Getty Images hide caption

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Frederic J. Brown/AFP/Getty Images

When LA's Air Got Better, Kids' Asthma Cases Dropped

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Thailand's Pollution Control Department declared air quality in the the Thai capital unhealthy, leading to the closure of 400 public schools through the end of the week. Romeo Gacad/AFP/Getty Images hide caption

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Romeo Gacad/AFP/Getty Images

Pollution has driven some families to leave Beijing. A group of Chinese lawyers is suing the governments of Beijing and its surrounding areas for not doing enough to get rid of the smog. Andy Wong/AP hide caption

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Andy Wong/AP

For Some In China's Middle Class, Pollution Is Spurring Action

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Smog blankets scyscrapers in Mexico City on March 17. The city is suffering its worst pollution in more than a decade, and cars are required to stay off the street one day a week. Rebecca Blackwell/AP hide caption

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Rebecca Blackwell/AP

In Mexico City, The Return Of Terrible Smog

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A woman wears a face mask on a hazy January day in downtown Shanghai. China has ordered a popular anti-pollution film removed from major online outlets. In Xi'an, two people who had protested against smog were reportedly detained. ALY SONG/Reuters /Landov hide caption

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ALY SONG/Reuters /Landov

Environmental Protection Agency Administrator Gina McCarthy testifies at an oversight hearing of the Senate Environment and Public Works Committee on Capitol Hill in Washington on July 23. J. Scott Applewhite/AP hide caption

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J. Scott Applewhite/AP