Singapore's air pollution index rises to unhealthy level no thanks to forest fires in Indonesia

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Singapore's air pollution rose to unhealthy levels on Monday, the National Environment Agency said, as winds changed direction and brought in light smoke from forest fires in neighbouring Indonesia.

Singapore is in the middle of its "haze" season, when smoke from forest clearing in Indonesia traditionally chokes the air, but this year has been practically haze free, despite warnings in May it was going to be worse than 2013's record pollution.

The three-hour Pollution Standards Index broke above 100, the level beyond which the air is considered unhealthy, at 1 a.m. and remained above that level into the daylight hours, the government agency said on its website.

The NEA warned on Sunday that if the wind blew from the southwest, Singapore could experience occasional haze from fires on Indonesia's Sumatra island.