Reported by World Air Quality Index today.
It is one of only 2 we have recorded within 20 km of this point since 4 May 2026. The last comparable one was on 4 May 2026.
What the source measured
World Air Quality Index reported: AQI 811 (Hazardous) at Ichihara (市原)
The air quality index read 811 (Hazardous) at the Ichihara (市原) station.
An estimated 27,422 people live within 5 km of this point.
Nearby, since 4 May 2026
- May 4, 2026 · score 26 · 16.9 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, at 66 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Air quality |
| Severity | critical |
| Calamity Score (ours) | 55 / 100 |
| Our confidence | 66% |
| Coordinates | 35.4978, 140.1157 |
| Nearest City | Ichihara (4 km) |
| Population Exposed | 27.4K within 5 km |
| Impact Tier | significant |
| Timestamp | 2026-09-01T18:00:00.000Z |
| Source | https://aqicn.org/city/@5562 |
Score Breakdown
Technical Details
| Aqi | 811 |
| AqiCategory | Hazardous |
| StationName | Ichihara (市原) |
| StationUid | 5562 |
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 10 February 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.
Want to know when something happens near Ichihara?
Calamity.live data shows a air quality event with CalamityScore 55/100, near Ichihara (Japan), based on data from waqi. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.