Primary sources of pollutants include exhaust emission from Beijing's more than five million motor vehicles, coal burning in neighbouring regions, dust storms from the north and local construction ...
Photographs of Beijing on a smoggy day (June 19, 2009) and a blue-sky day (June 22, 2009), courtesy of China Air Daily. (Lin Yang and John Billingsley/Asia Society) China Air Daily, a project of Asia ...
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