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 ...
This photo, taken by Reddit user BananasUnited, shows the difference between a "clear" day, with a AQI of less than 500, and a smoggy day, with an AQI of more than 500. AQI stands for Air Quality ...
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