SINGAPORE - Occasional hazy conditions can still be expected on Tuesday, the National Environment Agency(NEA) said in an advisory.

"The 24-hour PSI for the next 24 hours is expected to be in the high end of the moderate range and the low end of the unhealthy range," NEA said on Monday evening.

Thundery showers are forecast for Singapore in the late morning and early afternoon on Tuesday.

It was slightly hazy in Singapore on Monday.

As of 8pm, the 24-hour Pollutant Standards Index (PSI) was 75 to 90, and the three-hour reading was 75.

"There has been a reduction in the extent of haze spreading westward from Kalimantan. However, haze is still observed over parts of Southern Sumatra," NEA said.

The total number of hotspots detected in Sumatra on Monday was 26. The low hotspot count was due to cloud cover over parts of Sumatra, NEA added.

Given the air quality forecast for the next 24 hours, it added that healthy people 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, NEA added.

For updates, visit the NEA website, the haze microsite, the NEA Facebook page and Twitter, or download the myENV app.