Air quality in Singapore remains in moderate range as PSI drops to below 100

Air quality in central Singapore has returned to a moderate level, according to the latest Pollution Standards Index (PSI) reading of 100, reported by the National Environment Agency (NEA) at 10pm on September 10. This marks a significant improvement from earlier in the week when the PSI peaked at an unhealthy 106 between 9am and 11am. The central region, along with the north, south, east, and west, all fell within the moderate range on the specified date.

Haze in Singapore has been a recurring issue, with the PSI crossing the 101 mark early on September 4. This prompted readings in central, eastern, and western parts of Singapore to occasionally enter the unhealthy range, before returning to the moderate category. The National Environment Agency (NEA) has forecasted that the PSI will range from the higher end of the moderate category to the lower end of the unhealthy spectrum.

The current haze situation is attributed to smoke plumes from fires in southern and central Sumatra, as well as Kalimantan. While showers are expected in northern and central Sumatra in the coming days, there remains a risk of smoke haze affecting Singapore should the fires continue under prevailing wind patterns. Air quality deteriorates to unhealthy levels when the PSI falls within the 101 to 200 range, prompting the public to minimize outdoor activities.

Moderate air quality is categorized by PSI readings between 51 and 100, while values of 0 to 50 are considered good.