Air Quality Forecast
PSI Forecast: 101 - 160 (Unhealthy)
Health Advisory
Healthy persons :PSI Forecast-Unhealthy. To plan for 22 Oct, reduce prolonged or strenuous outdoor physical exertion. For immediate outdoor activities, use 1h PM2.5. If Elevated PM2.5, reduce strenuous outdoor activity.
Elderly, pregnant women & children :PSI Forecast-Unhealthy. To plan for 22 Oct, minimise prolonged or strenuous outdoor physical exertion. For immediate outdoor activities, use 1h PM2.5. If Elevated PM2.5, avoid strenuous outdoor activity for the next hour.
Persons with chronic lung/heart disease :PSI Forecast-Unhealthy. To plan for 22 Oct, avoid prolonged or strenuous outdoor physical exertion. For immediate outdoor activities, use 1h PM2.5. If Elevated PM2.5, avoid strenuous outdoor activity for the next hour.
Refer to the 1-hr PM2.5 for immediate activities, and the 24-hr PSI forecast to plan ahead.
Singapore, 21 October 2026 – The PSI forecast for 22 Oct 2026 is 101 – 160 (Unhealthy).
2. The PSI forecast and corresponding health advisories should be used for planning next day outdoor activities.
3. For immediate outdoor activities, please check the 1-hr PM2.5 concentration readings and personal guide on our haze microsite (
www.haze.gov.sg) or mobile app (myENV).
Update on Hotspot and Haze Situation
4. Showers fell mainly over western Singapore this afternoon. As at 7pm, the 1-hr PM2.5 concentration readings were 34 – 92 µg/m3, in (Band 1, Normal / Band 2, Elevated), and the 24-hr PSI was 80 – 123, in the Moderate to Unhealthy range. Smoke haze from Kalimantan was observed in our vicinity. Smoke haze was also observed over Sumatra.
5. For tomorrow, while showers are forecast over Singapore and the surrounding region, dry conditions are expected over the southern parts of Kalimantan. Under prevailing east-southeasterly or southeasterly winds, smoke haze from fires in Kalimantan may be transported towards Singapore.
6. On Friday, some smoke haze from fires in the region may continue to be transported towards Singapore under forecast southeasterly or south-southeasterly winds. On Saturday, winds are expected to shift to blow towards the southwest. Given the dry conditions forecast over southern and central Sumatra, smoke haze from Sumatra may drift towards Singapore.
Activity Guidelines
7. The health impact of haze is dependent on one’s health status, the PSI level, and the length and intensity of outdoor activity.
8. For updates, visit our haze microsite (www.haze.gov.sg), the NEA website (www.nea.gov.sg), MSS website (www.weather.gov.sg), mobile app (myENV) or follow us on NEA Facebook (www.facebook.com/NEASingapore). For information on the distribution of hotspots detected over the past fortnight in the region, please refer to the ASEAN Specialised Meteorological Centre (ASMC) website at http://asmc.asean.org.
Areas with lighter smoke haze are not indicated as they cannot be clearly discerned from satellite imagery. The full extent of the hotspot and smoke haze situation could not be determined due to cloud cover.
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