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People wear face masks as they walk in Singapore on June 21, 2013.... News PhotoAir Pollution,Child,City,Environment,Environmental Damage,Environmental Issues,Fog,Girls,Horizontal,Human Body Part,Human Face,People,Protective Mask - Workwear,Singapore,WalkingPhotographer Collection: AFP 2013 AFPPeople wear face masks as they walk in Singapore on June 21, 2013. Singapore's smog index hit the critical 400 level on June 21, making it potentially life-threatening to the ill and elderly people, according to a government monitoring site. AFP PHOTO / Roslan Rahman (Photo credit should read ROSLAN RAHMAN/AFP/Getty Images)