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A woman wearing a mask walks on a street during severe pollution in... News PhotoAccidents and Disasters,Adult,Air Pollution,Beijing,China - East Asia,City,Close-up,Environment,Horizontal,Pollution,Portrait,Protective Mask - Workwear,Serious,Street,Walking,WomenPhotographer Collection: AFP 2013 AFPA woman wearing a mask walks on 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'. By 4pm the particle matter (PM) 2.5 figure was 728 on a scale that stops at 500 at which point the US embassy website advises against all outdoor activity. AFP PHOTO / Ed Jones (Photo credit should read Ed Jones/AFP/Getty Images)