Haze in Singapore, Indonesia under pressure...

The haze enveloping Singapore reached unhealthy levels on Thursday, with the PSI recording hitting a high of 108.

The National Environment Agency (NEA) says the three-hour Pollutant Standards Index (PSI) reading rose to 108 at 6pm, after crossing over the 100-mark at 5pm.

The highest three-hour PSI recorded for Singapore was 226 on 18 September, 1997.

A PSI reading of 0-50 means the air quality is in the good range; 51-100 moderate range; 101-200 unhealthy range; 201-300 very unhealthy; and above 300 hazardous.  More...

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