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Skies slightly hazier than usual with PSI hitting 50

Published on Dec 30, 2013 5:54 PM
Marina Bay Sands and bumboat on Dec 30, 2013, at 11.05am. The skies were slightly hazier than usual on Monday. -- ST PHOTO: LIM YAOHUI 

The skies were slightly hazier than usual on Monday.

The three-hour PSI or Pollutant Standards Index, a measure of air quality, began creeping up on Sunday afternoon, and was 50 at lunchtime on Monday. At 6pm, the three-hour PSI was 38, while the 24-hour PSI was 44 to 49.

A PSI of 0 to 50 remains in the 'good' range, while that between 51 and 100 is 'moderate'.

The National Environment Agency (NEA) said the conditions were due to dust blowing from the north and northeast.

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