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Haze update

Air quality improves in afternoon; PSI drops from morning high

Published on Sep 7, 2012 4:35 PM
Air quality in Singapore improved in the afternoon on Friday and the Pollutant Standard Index (PSI) returned to a healthy range. -- PHOTO: AFP

Air quality in Singapore improved in the afternoon after the Pollutant Standards Index (PSI) hit a year high of 65-75 early Friday morning, triggering a health warning as the National Environment Agency (NEA) advised people with heart or respiratory ailments, the elderly and children to reduce physical exertion and outdoor activities.

The PSI reading at 4pm was 49 as favourable winds from morning helped to clear the air. However, two hours later at 6pm, PSI inched up to 52. Air quality is considered good when PSI is 50 or less.

To keep the public informed more regularly of the haze situation, the NEA announced on Friday afternoon that it will provide hourly updates of the 3-hour PSI from 7am to 7pm daily. Click here to view the NEA's updates on the haze situation.

In its latest update at about 3pm, the NEA said: "The direction of the prevailing winds have changed from southwesterly to southeasterly/southerly since yesterday evening, bringing about improved air quality and visibility since early morning. The southeasterly/southerly winds are expected to be maintained over the weekend and bring an improvement to the current hazy conditions."

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