Right now
The most recent data we hold from World Air Quality Index arrived 3 hours ago, and this point is in it.
3 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
Reported by World Air Quality Index today.
It is the 3rd strongest of the 270 detections recorded within 20 km of this point since 14 March 2026. Another comparable one was recorded here earlier the same day. 28 more were recorded here in the fortnight before it.
What the source measured
World Air Quality Index reported: AQI 158 (Unhealthy) at CHS 18 P2 88c338
The air quality index read 158 (Unhealthy) at the CHS 18 P2 88c338 station.
Urban PEI: 715,345 within a heuristic 5 km radius; not unique people.
Nearby, since 14 March 2026
- September 10, 2026 · score 50 · 1.3 km
- September 4, 2026 · score 50 · 1.3 km
- September 3, 2026 · score 50 · 1.3 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 55 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) | 55 / 100 |
| Legacy data-support index | 0.65/1 |
| Coordinates | -33.4470, -70.6134 |
| Nearest City | Ñuñoa (3 km) |
| Urban exposure index (PEI) | 715.3K within 5 km |
| Impact Tier | significant |
| Timestamp | 2026-09-18T15:41:20.000Z |
| Source | https://aqicn.org/city/@-535489 |
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: 2026-09-18T15:41:20.000Z.
First archived: 2026-09-18T15:47:45.056Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-18T21:53:19.867Z · data_change
Index 55 → 55; severity medium → medium; version 5 → 5.
2026-09-18T16:14:58.786Z · data_change
Index 55 → 55; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Aqi | 158 |
| AqiCategory | Unhealthy |
| StationName | CHS 18 P2 88c338 |
| StationUid | -535489 |
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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