HONG KONG - APRIL 15: A U.S. Navy personnel stands guard on board the amphibious assault ship USS Peleliu (LHA 5) with the polluted Hong Kong skyline in the background on April 15, 2013 in Hong Kong, Hong Kong. A government warning has been issued after Hong Kong's environmental protection department reported today that Air Pollution Index results of over 100, due to increasing nitrogen dioxide concentrations. (Photo by Lam Yik Fei/Getty Images)
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