24-hour PSI in Singapore at 1:00 pm: North 135 (unhealthy), South 153 (unhealthy), East 173 (unhealthy), West 181 (unhealthy), Central 185 (unhealthy). Highest in the Central, and rising. 1-hour PM2.5 up to 242 µg/m³ (West). Today's air was over the Riau Islands 24 hours ago and over Borneo the day before, passing 12 fires.
Singapore's haze mostly comes from land and forest fires in Sumatra and Kalimantan, carried here by the wind, most often during the Southwest Monsoon from about June to October. The map above traces the air reaching Singapore back 48 hours along NOAA's wind forecasts, shows NASA's satellite fire detections it passed over, and looks 48 hours ahead.
See the PSI by region, or get a Telegram alert when the haze gets worse and when it clears: @WindowSingaporeBot.