The Republic’s air quality worsened on Wednesday Oct 8 evening, as the three-hour Pollutants Standard Index PSI hit the ‘unhealthy’ range at 6pm with a 3-hour PSI reading of 102. The 3-hour PSI reading rose to 105 as of 7pm and stayed at 107 as of 9pm, The 24-hour PSI reading remained in the ‘moderate’ range at 79 to 90.
The National Environment Agency NEA noted that it was “slightly hazy” in the afternoon, and attributed this to smoke haze blown in from southern Sumatra by prevailing southerly winds. Singapore’s met agency detected 110 hotspots on the Indonesian island of Sumatra on Wednesday, up from about 100 the day before.
“The hazy conditions are expected to persist tonight,” NEA stated on its website.For Thursday, NEA forecast thundery showers in the afternoon, but said hazy conditions can be expected, as prevailing winds are expected to come from a southeasterly and southwesterly direction.
“The overall air quality for the next 24 hours is expected to be mainly in the high-end of ‘moderate’ range and low-end of the ‘unhealthy’ range,” NEA said.