SINGAPORE - Hazy conditions were expected over parts of Singapore on Wednesday (April 11), the National Environment Agency (NEA) said.
In a statement on its Facebook page and website at around 5pm, NEA said it detected "a hot spot with dense smoke plume in the south-eastern part of Johor this afternoon".
"The smoke haze from the hot spot is being blown by the prevailing easterly winds towards Singapore," said NEA.
It said hazy conditions are expected over parts of Singapore for "the next few hours".
A burning smell may also be detected.
The 24-hour PSI is forecast to be at the higher end of the moderate range.
According to NEA's 5pm reading for Wednesday, the 24-hour PSI was 48-57, in the moderate range.
The 1-hour PM2.5 concentration readings were 5-36µg/m3, in Band II (Elevated). The maximum band is Band IV (Very High).
In an update at around 7.30pm, NEA said the density of smoke haze from Johor has reduced.
"Due to a shift in the prevailing winds, from blowing from the east to blowing from the northeast now, the haze is being blown to the sea areas to the southeast of Singapore. The burning smell over eastern Singapore has lessened," it said.
As at 7pm, the 24-hr PSI was 51-57, in the moderate range, and the 1-hr PM2.5 concentration readings were 9-27µg/m3, in Band I (Normal).
Undergraduate Hazel Kang, 22, said she was shocked to see the haze when she came out of a classroom in the National University of Singapore. "The air feels quite dry too," she added.
Another student, Lim Jia Xi, 18, said the haze around Temasek Polytechnic was not the worst he has seen, though it affected his vision quite badly.