Right now
The most recent data we hold from World Air Quality Index arrived 3 hours ago, and this point is in it.
Nothing else has been detected within 20 km in the last 24 hours.
Reported by World Air Quality Index today.
It is the strongest of the 11 detections recorded within 20 km of this point since 2 September 2026. The last comparable one was on 17 September 2026. 7 more were recorded here in the fortnight before it.
What the source measured
World Air Quality Index reported: AQI 226 (Very Unhealthy) at Tanjung Harapan, Indonesia
The air quality index read 226 (Very Unhealthy) at the Tanjung Harapan, Indonesia station.
Urban PEI: 29,442 within a heuristic 5 km radius; not unique people.
This is the highest air quality index we have recorded at this point, over 143 readings since 18 September 2026 — the previous range was 172 to 226.
Nearby, since 2 September 2026
- September 17, 2026 · score 41 · 0.0 km
- September 16, 2026 · score 41 · 0.0 km
- September 15, 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 48 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 | High |
| Calamity Score (ours) | 48 / 100 |
| Legacy data-support index | 0.61/1 |
| Coordinates | 2.8300, 117.3600 |
| Nearest City | Tanjung Selor (2 km) |
| Urban exposure index (PEI) | 29.4K within 5 km |
| Impact Tier | significant |
| Timestamp | 2026-09-18T14:00:00.000Z |
| Source | https://aqicn.org/city/@13505 |
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: 2026-09-18T14:00:00.000Z.
First archived: 2026-09-18T05:38:59.296Z. Material modification: 2026-09-18T15:47:56.255Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-18T16:14:57.646Z · data_change
Index 48 → 48; severity high → high; version 5 → 5.
2026-09-18T15:47:56.255Z · data_change
Index 41 → 48; severity medium → high; version 5 → 5.
2026-09-18T12:43:53.833Z · data_change
Index 41 → 41; severity medium → medium; version 5 → 5.
2026-09-18T09:13:33.468Z · data_change
Index 41 → 41; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Aqi | 226 |
| AqiCategory | Very Unhealthy |
| StationName | Tanjung Harapan, Indonesia |
| StationUid | 13505 |
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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