SINGAPORE - The hazy conditions in Singapore worsened on Thursday (Sept 24), as denser haze from Sumatra was blown in by the prevailing southerly winds.
At 3pm on Thursday, the 24-hour Pollutant StandardsIndex (PSI) was 188-231, in the higher end of the unhealthy range to the low end of the very unhealthy range.
The three-hour PSI, which is not tied to a health advisory, spiked at 262 at noon but dropped to 225 at 3pm. It rose slightly again to 232 at 4pm.