Haze watch: Air quality improves, PSI returns to moderate levels across Singapore

Air quality in the Republic improved on Sunday (Oct 4) morning as 24-hour Pollutant Standards Index (PSI) in central Singapore returned to the moderate range.It entered the unhealthy range at 11am on Saturday.At 10am on Sunday, PSI readings across Singapore ranged from 76 to 99 — in the moderate range. The highest reading of 99 was recorded in the central region. Meanwhile one-hour PM2.5, an indicator of fine particulate matter in the air, ranged between 15 and 44. Concentration readings from 0 to 55 denote the normal band. In its daily haze situation update on Saturday evening, the National Environment Agency (NEA) said the country's 24-hour PSI is forecast to be in the high-moderate to low-unhealthy range.It noted that moderate to dense smoke plumes from southern Sumatra were observed drifting towards Singapore and surrounding region, while smoke haze was also observed from fires in Kalimantan.