Showers bring PM2.5 back to normal band in 4 regions; haze outlook likely to improve from Monday
Moderate to heavy thundery showers across several areas of Singapore on Saturday (Oct 24) afternoon helped improve haze conditions, with hourly PM2.5 falling into the normal band (0 to 55µg/m3) in four regions.At 5pm, 1-hour PM2.5 concentration readings ranged between 33 in northern Singapore to 97 in the western region. Elsewhere, the central (43), southern (50) and eastern (53) regions were also in the normal band.Meanwhile, 24-hour Pollutant Standards Index (PSI) remained in the unhealthy range (101 to 200) across Singapore, with the highest reading of 151 recorded in the western region.Explaining the haze, which affected Singapore overnight, the National Environment Agency (NEA) said this was due to smoke haze from Sumatra drifting towards the city state.It added that smoke haze was also observed over Kalimantan.