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This picture taken from a Kamov helicopter operated by Indonesia's Disaster Mitigation Agency shows fires burning at a concession area in Pelalawan, Riau province on September 17, 2015. Southeast Asia has been enveloped in choking haze from agricultural fires in Indonesia over the past fortnight, prompting flight cancellations, closing schools and raising fears this weekend's glitzy Formula One night race in Singapore could be affected. AFP PHOTO / ADEK BERRY (Photo credit should read ADEK BERRY/AFP/Getty Images)

This picture taken from a Kamov helicopter operated by Indonesia's Disaster Mitigation Agency shows fires burning at a concession area in Pelalawan, Riau province on September 17, 2015. Southeast Asia has been enveloped in choking haze from agricultural fires in Indonesia over the past fortnight, prompting flight cancellations, closing schools and raising fears this weekend's glitzy Formula One night race in Singapore could be affected. AFP PHOTO / ADEK BERRY        (Photo credit should read ADEK BERRY/AFP/Getty Images)