Right now
The most recent data we hold from World Air Quality Index arrived 18 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
One other detection within 20 km in the last 24 hours, <1 km from here.
Reported by World Air Quality Index yesterday.
It is one of only 4 we have recorded within 20 km of this point since 28 August 2026. The last comparable one was on 22 September 2026. 3 more were recorded here in the fortnight before it.
What the source measured
World Air Quality Index reported: AQI 153 (Unhealthy) at Medan, Indonesia
The air quality index read 153 (Unhealthy) at the Medan, Indonesia station.
Urban PEI: 17,489 within a heuristic 5 km radius; not unique people.
Nearby, since 28 August 2026
- September 26, 2026 · score 41 · 0.0 km
- September 22, 2026 · score 41 · 0.0 km
- September 14, 2026 · score 41 · 0.0 km
How we know
One source: World Air Quality Index. Not yet confirmed by a second, independent source.
Our own score for this event is 41 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Air Quality |
| Severity | Medium |
| Calamity Score (ours) | 41 / 100 |
| Legacy data-support index | 0.68/1 |
| Coordinates | 3.5900, 98.8500 |
| Nearest City | Percut (5 km) |
| Urban exposure index (PEI) | 17.5K within 5 km |
| Impact Tier | significant |
| Timestamp | 2026-09-25T19:00:00.000Z |
| Source | https://aqicn.org/city/@8287 |
Physical priority index · v5. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: waqi. Occurrence: 2026-09-25T19:00:00.000Z.
First archived: 2026-09-25T13:42:52.607Z. Material modification: 2026-09-25T20:14:04.902Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-25T20:14:04.902Z · data_change
Index 41 → 41; severity medium → medium; version 5 → 5.
2026-09-25T19:41:41.078Z · data_change
Index 41 → 41; severity medium → medium; version 5 → 5.
2026-09-25T17:44:26.623Z · data_change
Index 41 → 41; severity medium → medium; version 5 → 5.
2026-09-25T16:45:17.599Z · data_change
Index 41 → 41; severity medium → medium; version 5 → 5.
2026-09-25T15:40:31.727Z · data_change
Index 41 → 41; severity medium → medium; version 5 → 5.
2026-09-25T14:41:34.494Z · data_change
Index 41 → 41; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Aqi | 153 |
| AqiCategory | Unhealthy |
| StationName | Medan, Indonesia |
| StationUid | 8287 |
| Network | official |
Safety Information
When air quality is hazardous: stay indoors with windows closed, and run a filtered air purifier if you have one. Avoid outdoor exercise. Children, older adults and anyone with heart or lung conditions are affected first and worst — an N95 respirator helps outdoors, a cloth mask does not.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
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