Clearer skies, fresher air as PSI, PM2.5 ease, but smoke haze could return from Oct 20 to 22: NEA

Sun shined brightly, along with clearer skies and fresher air continued into a second day on Monday (Oct 19) amid a favourable wind direction. Throughout the day, hourly PM2.5 was mostly in the normal band (0 to 55µg/m3) in the northern, eastern and southern regions, with 24-hour Pollutant Standards Index (PSI) in this area also remaining in the good-to-moderate range.In central and western Singapore, the concentration reading was in the low-elevated band, while PSI dropped towards the low-unhealthy range.At 6pm, concentration readings ranged from 51 in eastern Singapore to 79 in the central region.Meanwhile, PSI readings were in the low-unhealthy range in western (114) and central (105) Singapore, but stayed in the good-to-moderate range in southern (88), northern (89) and the eastern (91) regions.