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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