Singapore Air Quality Forecast to Stay Moderate to Low-Unhealthy on Tuesday

Singapore’s air quality remained in the moderate range on Monday, but the National Environment Agency warned that Tuesday’s 24-hour Pollutant Standards Index could move into the low-unhealthy range.

The 24-hour PSI stood between 63 and 85 at 6 p.m. on Monday. The agency said healthy people, older adults, pregnant women, children and those with chronic lung or heart conditions could continue normal activities if the next day’s air quality remained moderate.

If conditions become unhealthy, healthy people should reduce prolonged or strenuous outdoor exercise. Older adults, pregnant women and children should minimise such activity, while people with chronic lung or heart disease should avoid it altogether, NEA said.

Moderate to dense smoke plumes from fires in southern and central Sumatra and West Kalimantan continued to drift toward Singapore. Showers were expected over parts of Kalimantan in the coming days, but dry conditions were forecast to persist over Singapore and southern and central Sumatra. “If the fires continue, there remains a risk of smoke haze affecting Singapore,” NEA said.

The agency said the health impact would depend on a person’s health, the PSI level and the duration and intensity of outdoor activity. It advised residents to check one-hour PM2.5 readings for immediate plans and use the 24-hour PSI forecast for activities the following day.

NEA began issuing daily haze advisories on Sept. 4 after the central region’s 24-hour PSI crossed 101, the start of the unhealthy band, at 7 a.m. The level had not crossed that threshold since Oct. 8, 2023. By midnight, the central, eastern and western regions had all recorded unhealthy PSI levels.

“

If the fires continue, there remains a risk of smoke haze affecting Singapore.