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A woman wears a mask as the Singapore Central Business District is covered with haze on Thursday. Singapore urged people to remain indoors amid unprecedented levels of air pollution as a smoky haze wrought by forest fires in neighboring Indonesia worsened dramatically. Joseph Nair / Associated Press
Haze from fires in Indonesia blanketing Singapore could persist for weeks or longer, the city-state's Prime Minister Lee Hsien Loong said on Thursday, as the smoke drove air quality to "hazardous" levels and disrupted business and travel in the region.