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Update: Air quality in Singapore remains unhealthy on Tuesday; 24-hour PSI at 1pm: 129-152

Traffic along The Tampines Expressway (TPE) at 7.10am on Tuesday, September 15, 2015. The 3-hr PSI reading at 7am was 113.

[SINGAPORE] It is another hazy day for Singapore on Tuesday (Sept 15) as the air quality continues to hover within the unhealthy range.

As of 1pm, the 24-hour Pollutant Standards Index (PSI) was between 129 and 152. The unhealthy range is 101-200. The three-hour PSI, an indicative reading not tied to health advisory, was 114 at 8am, after surpassing the 200-mark on Monday night. If the air quality stays above 200 for 24 hours, it would be considered very unhealthy (201-300).

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