Air Quality Forecast
24-hr PSI Forecast: Moderate – Low Unhealthy
Health Advisory
Healthy persons: If 24-hr PSI is Moderate, normal activities. If 24-hr PSI is Unhealthy, reduce prolonged or strenuous outdoor physical exertion. If 1-hr PM2.5 is Normal (Band 1), normal activities. If 1-hr PM2.5 is Elevated (Band 2), reduce strenuous outdoor activity for the next hour.
Elderly, pregnant women & children: If 24-hr PSI is Moderate, normal activities. If 24-hr PSI is Unhealthy, minimise prolonged or strenuous outdoor physical exertion. If 1-hr PM2.5 is Normal (Band 1), normal activities. If 1-hr PM2.5 is Elevated (Band 2), avoid strenuous outdoor activity for the next hour.
Persons with chronic lung/heart disease: If 24-hr PSI is Moderate, normal activities. If PSI is Unhealthy, avoid prolonged or strenuous outdoor physical exertion. If 1-hr PM2.5 is Normal (Band 1), normal activities. If 1-hr PM2.5 is Elevated (Band 2), 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 September 2026 – Showers fell over many parts of Singapore in the afternoon today. As at 6pm, the 1-hr PM2.5 concentration readings were 20 – 33 µg/m3, in Band 1 (Normal), and the 24-hr PSI was 66 – 81, in the Moderate range.
Update on Hotspot and Haze Situation
2. Moderate to dense smoke plumes continue to be observed from fires in Kalimantan and southern Sumatra.
3. While some showers are forecast over the surrounding region, dry conditions are expected to continue in southeastern Sumatra and southwestern Kalimantan. With the prevailing winds forecast to continue blowing from the southeast, there remains a risk of smoke haze affecting Singapore. The 24-hr PSI for Singapore is forecast to be in the Moderate – Low Unhealthy range.
Activity Guidelines
4. The health impact of haze is dependent on one’s health status, the PSI level, and the length and intensity of outdoor activity. For immediate outdoor activities, please check the 1-hr PM2.5 concentration readings and personal guide. Use the 24-hr PSI forecast and corresponding health advisories for planning next day outdoor activities.
5. 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 extensive cloud cover.
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