SINGAPORE - Slightly hazy conditions are expected to return on Saturday (Oct 10), the National Environment Agency (NEA) has said in an advisory.

"The 24-hour PSI for the next 24 hours is expected to be in the high end of moderate range and the low end of the unhealthy range, and may enter the mid-section of the unhealthy range if winds are unfavourable," NEA said in the statement issued on Friday evening.

The 24-hour Pollutant Standards Index (PSI) was in the high end of the moderate range on Friday. As of 11pm, the 24-hour PSI was 82 to 92. The three-hour PSI stood at 73.

NEA said that widespread haze is still persisting over parts of southern and central Sumatra.

"Some haze from Sumatra is also observed to have spread to the surrounding sea areas to the south of Singapore," it added.

On Saturday, the prevailing winds are forecast to blow from the south-east or south.

Given the air quality forecast, healthy persons should reduce prolonged or strenuous outdoor physical exertion. The elderly, pregnant women and children should minimise prolonged or strenuous outdoor physical exertion, while those with chronic lung or heart disease should avoid prolonged or strenuous outdoor physical exertion.

People who are not feeling well, especially the elderly and children, and those with chronic heart or lung conditions, should seek medical attention.

For updates, go to the NEA website (www.nea.gov.sg), the haze microsite (www.haze.gov.sg), follow NEA on Facebook (www.facebook.com/NEASingapore) and NEA Twitter (@NEAsg), or download the myENV app.