Right now
The most recent data we hold from World Air Quality Index arrived 6 minutes 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 one of only 3 we have recorded within 20 km of this point since 20 August 2026. The last comparable one was on 23 September 2026. 3 more were recorded here in the fortnight before it.
What the source measured
World Air Quality Index reported: AQI 170 (Unhealthy) at Mengcun Environmental Protection Bureau, Cangzhou (沧州市孟村环境保护局)
The air quality index read 170 (Unhealthy) at the Mengcun Environmental Protection Bureau, Cangzhou (沧州市孟村环境保护局) station.
This is the highest air quality index we have recorded at this point, over 35 readings since 25 September 2026 — the previous range was 168 to 170.
Nearby, since 20 August 2026
- September 23, 2026 · score 29 · 0.0 km
- September 15, 2026 · score 29 · 0.0 km
- September 12, 2026 · 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 29 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) | 29 / 100 |
| Legacy data-support index | 0.47/1 |
| Coordinates | 38.0450, 117.0980 |
| Nearest City | Cangzhou (37 km) |
| Urban exposure index (PEI) | 0 within 5 km |
| Impact Tier | minor |
| Timestamp | 2026-09-25T14:00:00.000Z |
| Source | https://aqicn.org/city/@9769 |
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: 2026-09-25T14:00:00.000Z.
First archived: 2026-09-25T11:56:32.800Z. Material modification: 2026-09-25T15:13:54.971Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-25T15:40:31.755Z · data_change
Index 29 → 29; severity medium → medium; version 5 → 5.
2026-09-25T15:13:54.971Z · data_change
Index 29 → 29; severity medium → medium; version 5 → 5.
2026-09-25T13:43:03.012Z · data_change
Index 29 → 29; severity medium → medium; version 5 → 5.
2026-09-25T13:16:50.239Z · data_change
Index 29 → 29; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Aqi | 170 |
| AqiCategory | Unhealthy |
| StationName | Mengcun Environmental Protection Bureau, Cangzhou (沧州市孟村环境保护局) |
| StationUid | 9769 |
| 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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