The three-hour Pollutant Standards Index (PSI) hit 103 at 5pm.
It fell to 82 at 9pm. Air quality is considered to be unhealthy when PSI readings range from 101 to 200.
Slight hazy conditions have been prevalent since Wednesday.
The National Environment Agency said they were due to smoke haze from fires in Sumatra. Occasional hazy conditions can still be expected today, said the agency.
Get MyPaper for more stories.