SINGAPORE - The three-hour Pollutant Standards Index (PSI) stands at 83, in the upper end of the moderate range, as of 9am on Tuesday morning.
The National Environment Agency (NEA) said thundery showers are expected in the late morning and early afternoon today.
Meanwhile, the 24-hour PSI reading is between 70 and 87.
Singapore was shrouded in haze that inched into the unhealthy range on Sunday and Monday, with the PSI peaking at 113, prompting people to start wearing masks.
In an update on Monday, the NEA said that the total number of hot spots detected in Sumatra and Kalimantan was 48 and 171 respectively.
The agency recommends that normal activities be carried out when the 24-hour PSI is in the moderate range.
If the 24-hour index hits the unhealthy band, healthy people should reduce prolonged or strenuous outdoor physical exertion, while the elderly, pregnant women and children should minimise such exertion.