PUBLISHED ONSeptember 14, 2026 1:45 AMUPDATEDSeptember 14, 2026 5:52 AMBYSean LerThe Republic's air quality is inching closer to unhealthy levels again on Monday (Sept 14) morning.
At 9.30am, the 24-hour Pollutant Standard Index (PSI) was between 73 and 92, within the moderate range, with the highest reading of 92 recorded in central Singapore.
A reading of between 101 to 200 denotes the unhealthy range.
Meanwhile, one-hour PM.25 at that time — an indicator of fine micro-pollutants in the air — was recorded at 107 in the central region.
The eastern, western and southern regions also recorded elevated one-hour PM2.5 readings of 85, 81 and 71 respectively.
This is also the first instance since Sept 4 that one-hour PM2.5 readings have crossed the mid-range mark. Readings of between 56 and 150 indicate the elevated range.
Members of the public should note that the health impact of haze is dependent on one's health status, the PSI level, and the length and intensity of outdoor activity.
Those who are planning to conduct or participate in outdoor activities immediately can check the 1-hour PM2.5 concentration readings and vulnerable persons guide.
Meanwhile, those who are planning outdoor activities for the next day should use the 24-hour PSI forecast and the corresponding health advisories for planning.
Healthy persons can continue with normal activities if PSI remains in the moderate range.
However, they should reduce prolonged or strenuous outdoor physical exertion if PSI crosses into the unhealthy range.
Elderly persons, pregnant women and children can also continue with normal activities if the PSI remains in the moderate range.
They should minimise prolonged or strenuous outdoor physical exertion if the PSI is in the unhealthy range.
Those with chronic lung or heart disease may similarly continue with normal activities when the PSI is moderate.
But they should avoid prolonged or strenuous outdoor physical exertion if the PSI reading crosses into the unhealthy range.
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