Singapore PSI Hits Unhealthy 101 for First Time Since October 2023

Singapore’s air quality entered unhealthy territory on September 4 when the 24-hour Pollutant Standards Index reached 101 in the central region at 7am. This marks the first breach of the unhealthy threshold (101-200 range) since October 8, 2023. The National Environment Agency began issuing daily haze advisories that evening, with smoke plumes from fires in Sumatra and Kalimantan drifting toward the island under southeasterly winds.

What triggered the unhealthy air quality

Dry conditions across the region combined with persistent fires in southern and central Sumatra and various parts of Kalimantan created smoke plumes that drifted toward Singapore. The National Environment Agency said the surrounding region remained mostly dry, and forecasts predict continued transboundary haze if fires persist and wind patterns hold. By 10pm on September 4, the PSI in the central region had climbed to 122, with the eastern region at 103.

Government contingency measures now active

Singapore’s Haze Task Force activated action plans across multiple agencies. Air-conditioned rooms in all community centres and selected residents’ committee centres will open to the public if the PSI exceeds 200, marking the “very unhealthy” threshold. All primary and tertiary classrooms have been equipped with air purifiers. Teachers across all institutions have been reminded to watch for unwell students or those with pre-existing lung or heart conditions.

Health guidance for different groups

The NEA advised healthy persons to reduce prolonged or strenuous outdoor activity when PSI is unhealthy. Vulnerable groups, including the elderly, pregnant women, children, and those with chronic heart or lung conditions, should minimise outdoor exertion and ensure medications are on hand. The public is advised to drink plenty of water to stay hydrated. Anyone who feels unwell should seek medical attention promptly.

Workplace adjustments and worker protections

Employers are urged to reduce the duration of strenuous work and rotate duties so workers spend less time outdoors. Mechanical aids such as trolleys and hoists should replace manual lifting when air quality is unhealthy. The NEA recommends checking the 24-hour PSI forecast to plan workdays and the one-hour PM2.5 reading to assess immediate outdoor activity risks. Workers in delivery, taxi, construction, cleaning, and security roles face particular exposure challenges.

Final Thoughts

With the PSI at 101 and forecasts pointing to higher unhealthy levels in coming days, Singapore residents and workers should monitor daily advisories and adjust outdoor activity accordingly. The government’s contingency measures are now in place for escalation if the PSI reaches 200 or higher.

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