Thundery showers on Wednesday (Sep 9) improved air quality slightly, but hazy conditions are expected to continue through Thursday (Sep 10).
The 24-hour Pollutant Standards Index at 11am on Thursday (Sep 10) was 95-107, in the high end of the Moderate range. The corresponding 3-hour PSI was at 133.
In an advisory on Wednesday, NEA said a total of 140 hotspots were detected in Sumatra. Hazy conditions will persist as prevailing winds are forecast to blow from the south and southwest. Showers are forecast for Singapore in the late morning and early afternoon on Thursday.
"The 24-hour PSI for the next 24 hours is expected to be in the high end of the Moderate range and low end of the Unhealthy range, and may further deteriorate if the winds are unfavourable," NEA added.
The elderly, pregnant women, and children should minimise prolonged or strenuous outdoor physical exertion. Members of the public who are feeling unwell should seek medical attention.