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Singapore haze: BBC's David Shukman explains

21 June 2013 Last updated at 19:15 BST

Pollution levels reached a new record high for a third day in a row in Singapore, as smoky haze from fires in Indonesia shrouded the city state.

The Pollutant Standards Index (PSI) hit 401 at 12:00 on Friday (04:00 GMT) - the highest in Singapore's history.

The index also reached 400 in one part of Indonesia, which is readying helicopters and cloud-seeding equipment in an effort to tackle the fires.

Schools in parts of Malaysia and Indonesia have closed temporarily.

David Shukman reports.

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