Haze Day What do the ASMC haze alert levels mean?
They are regional fire-and-smoke risk levels from the ASEAN Specialised Meteorological Centre: Level 0 no transboundary haze risk, Level 1 the dry season has started, Level 2 increasing risk of transboundary haze, and Level 3 a high risk of severe transboundary haze. They are not local air-quality readings.
What moves the level up
Level 2 follows escalating hotspots with moderate to dense smoke for two or more days, persistent dry weather and winds blowing smoke towards neighbouring countries. Level 3 needs significant, persistent hotspots with widespread smoke under the same conditions.
What to do at each level
Treat the alert as a heads-up, not as an instruction: at Level 2 or 3, check the local 1-hour PM2.5 more often, get masks and a purifier ready, and plan indoor alternatives for outdoor events. Act on the local reading.
Related guides
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Sources
- ASEAN Specialised Meteorological Centre (ASMC) — ASEAN Specialised Meteorological Centre, hosted by the Meteorological Service Singapore · official site
- NASA FIRMS active-fire detections (VIIRS) — NASA Fire Information for Resource Management System (FIRMS) · official site · API / docs
- haze.gov.sg regional haze situation and outlook — NEA, drawing on the ASEAN Specialised Meteorological Centre · official site
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