A junk sails past the city's skyline shrouded in a dense blanket of toxic smog in Hong Kong on April 15, 2013. The air pollution index reached the 'severe' level for the third time in 2013 with high concentrations of nitrogen dioxide present. AFP PHOTO / Philippe Lopez (Photo by Philippe LOPEZ / AFP) (Photo by PHILIPPE LOPEZ/AFP via Getty Images)
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AFP PHILIPPE LOPEZ