Construction workers wear face masks, to protect them from a heavy smoke haze, as they perform morning exercises at the start of their shift in Singapore June 20, 2013. Singapore's air quality deteriorated to "hazardous" levels late on Wednesday as smoke from slash-and-burn land clearing in Indonesia enveloped the city-state, inflaming tensions between the Southeast Asian neighbors. REUTERS/Tim Wimborne (SINGAPORE - Tags: ENVIRONMENT ...
más Construction workers wear face masks, to protect them from a heavy smoke haze, as they perform morning exercises at the start of their shift in Singapore June 20, 2013. Singapore's air quality deteriorated to "hazardous" levels late on Wednesday as smoke from slash-and-burn land clearing in Indonesia enveloped the city-state, inflaming tensions between the Southeast Asian neighbors. REUTERS/Tim Wimborne (SINGAPORE - Tags: ENVIRONMENT BUSINESS CONSTRUCTION HEALTH TPX IMAGES OF THE DAY)
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