SINGAPORE - Air quality in Singapore improved on Wednesday night with the 24-hour Pollutant Standards Index (PSI) entering the moderate range.
In an update on Wednesday evening, the National Environment Agency (NEA) said the the 24-hour PSI was expected to remain in the moderate range on Thursday.
"For tomorrow the prevailing winds are forecast to be weak and to blow from the east or south-east," the NEA statement said for Thursday. "Occasional slightly hazy conditions can be expected."
For most of Wednesday, hazy conditions were still prevalent over most parts of Singapore, although air quality had improved slightly.
Widespread showers on Wednesday morning brought improvement to the hazy conditions in Singapore. The 24-hour PSI had dropped to the low section of the unhealthy (101-200) range for most of the day, compared to the mid to high levels experienced on Tuesday.
At 4am, the 24-hour PSI reading was entirely in the moderate range, from 70-86. The three-hour PSI, which is not tied to a healthy advisory, stood at 78.
Eight hotspots were detected in Sumatra on Wednesday, with the low count attributed to a partial satellite pass. Widespread haze was also observed over the Indonesian island, with some haze from Kalimantan seen in the seas far to the south of Singapore.
On Tuesday, the haze from forest fires in Indonesia reached southern Thailand, with smoke from the dust particles rising above safety levels.
The worst-hit provinces were Phuket, Songkhla and Satun. Thai authorities responded by distributing face masks and urged residents to stay indoors.