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PSI levels higher after including readings of fine particles

Published on Apr 1, 2014 12:47 PM
 
Singapore's air quality readings have been updated from April 1, 2014, to include fine particles so the Pollutant Standards Index (PSI) levels now looks higher than before. -- ST FILE PHOTO: NG SOR LUAN

Singapore's air quality readings have been updated from Tuesday to include fine particles, so the Pollutant Standards Index (PSI) levels now looks higher than before.

The PSI, a measure of air quality, now includes the reading of PM2.5 - fine particles smaller than 2.5 microns in diameter - as a component.

The change was implemented to simplify the readings, said Minister for the Environment and Water Resources Vivian Balakrishnan, when announcing the changes in his ministry's budget debate last month.

Previously, the PM2.5 level was reported separately from the PSI reading.

 
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