Singapore haze: BBC's David Shukman explains

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. via Pocket http://www.bbc.co.uk/news/world-asia-23011189#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa