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

toggle caption 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

toggle caption J. Scott Applewhite/AP

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