BEIJING - JAN 12: Severe air pollution on January 12, 2013 in Beijing, China. Air quality index levels were classed as "Beyond Index" (PM 2.5 of over 700 micrograms per cubic meter).
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BEIJING - JAN 12: Severe air pollution on January 12, 2013 in Beijing, China. Air quality index levels were classed as "Beyond Index" (PM 2.5 of over 700 micrograms per cubic meter).