Copernicus CAMS model data for the grid cell over Jakarta put average fine-particle pollution at 47.8 µg/m³ on 26 September 2026 — 3.2 times the WHO 24-hour guideline of 15 µg/m³. Every one of the previous 7 full days was also above that line, averaging 42.1 µg/m³ with a worst day of 52.4 µg/m³. A revisit the next day found 51.8 µg/m³, an eighth day running, so this looks like a sustained episode rather than a one-day spike.
What this is not: it is not a street-level measurement. CAMS is a roughly 40 km model that smooths city hotspots and can misplace smoke or dust plumes, so the true figure in any one neighbourhood may be higher or lower. It judges PM2.5 only — ozone, nitrogen dioxide and indoor air are not assessed — and the WHO figure is a health guideline, not a legal limit. The record says nothing about where the particles came from. Context notes an El Niño phase, which can favour drier, more stagnant air, and no nearby natural events were logged.
What would change our mind: ground monitor readings near or below the guideline, or a model revision bringing daily means back under 15 µg/m³.
Written by AI, then checked by a separate reviewer before publication. Every claim points at the evidence below.