Air Quality Forecast
24-hr PSI Forecast: High 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, 18 September 2026 – Some showers occurred over the northern parts of Singapore in the afternoon today. As at 5pm, the 1-hr PM2.5 concentration readings were 31 – 61 µg/m3, in Band 1 (Normal) / Band 2 (Elevated), and the 24-hr PSI was 64 – 86, in the Moderate range.
Update on Hotspot and Haze Situation
2. Dry conditions persisted over southern Sumatra and Kalimantan. Smoke plumes from fires in Kalimantan were observed to drift towards Singapore. Some smoke plumes were also observed in southern Sumatra.
3. Dry conditions are forecast to continue over parts of southern Sumatra and Kalimantan. There is a risk of smoke haze affecting Singapore as the prevailing winds are expected to blow from the east-southeast or southeast. The 24-hr PSI for Singapore is forecast to be in the High 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.
- End -