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A woman walks past Chinese paramilitary policemen wearing protection masks on Tiananmen Square in Beijing as the capital of China is blanketed by heavy smog on Wednesday, January 4, 2017. China has long faced some of the worst air pollution in the world, blamed on its reliance of coal for energy and factory production, as well as a surplus of older, less efficient cars on its roads. Inadequate controls on industry and lax enforcement of standards have worsened the pollution problem. (Photo by Andy Wong/AP Photo)
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