SINGAPORE - The 24-hour Pollutant Standards Index (PSI) will remain in the moderate range for Thursday (Sept 1) but slightly hazy conditions could develop over the weekend, said the National Environment Agency (NEA).
The one-hour PM2.5 concentration over the next 24 hours is expected to remain in Band I or "normal" range, NEA said in an advisory issued after 5pm on Wednesday (Aug 31).
The prevailing winds are forecast to blow from the south on Thursday, but they are expected to gradually shift to blow from the south-west or west.
"Slightly hazy conditions can be expected over the weekend if fires emerge in Sumatra and the situation deteriorates over the next few days," NEA said.
The agency said it is monitoring closely and will provide updates when necessary.
Thundery showers are expected on Thursday morning for Singapore.
Given the air quality forecast for the next 24 hours, everyone can continue with normal activities. People who are not feeling well, especially the elderly and children, and those with chronic heart or lung conditions, should seek medical attention.
On Wednesday, the 24-hour PSI was in the good to moderate range (47 - 65) from morning till 5pm.
There were four hotspots detected in Sumatra on Wednesday. No visible haze was observed, and there have been showers over parts of Sumatra during the day.