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A woman wearing a mask crosses a street during severe pollution in... News PhotoAdult,Air Pollution,Beijing,China - East Asia,Emergencies and Disasters,Environment,Horizontal,Pollution,Protective Mask - Workwear,Serious,Street,WomenPhotographer Collection: AFP 2013 AFPA woman wearing a mask crosses a street during severe pollution in Beijing on January 12, 2013. Air quality data released via the US embassy twitter feed recorded air quality index levels so hazardous that they were classed as 'Beyond Index'. Just after midday the particle matter (PM) 2.5 figure was 519 on a scale that stops at 500, and advises against all outdoor activity. AFP PHOTO / Ed Jones (Photo credit should read Ed Jones/AFP/Getty Images)