Reported by World Air Quality Index today.
It is the strongest of the 27 detections recorded within 20 km of this point since 14 March 2026. The last comparable one was on 29 August 2026.
What the source measured
World Air Quality Index reported: AQI 160 (Unhealthy) at Sofia_Yavorov
The air quality index read 160 (Unhealthy) at the Sofia_Yavorov station.
An estimated 487,571 people live within 5 km of this point.
Nearby, since 14 March 2026
- August 3, 2026 · score 35 · 5.8 km
- August 23, 2026 · score 14 · 9.4 km
How we know
Confirmed by 2 independent sources, including World Air Quality Index.
Our own score for this event is 50 out of 100, at 67 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Air Quality |
| Severity | Critical |
| Calamity Score (ours) | 50 / 100 |
| Our confidence | 67% |
| Coordinates | 42.6915, 23.3422 |
| Nearest City | Sofia (2 km) |
| Population Exposed | 487.6K within 5 km |
| Impact Tier | severe |
| Timestamp | 2026-09-04T04:08:19.000Z |
| Source | https://aqicn.org/city/@-576160 |
Score Breakdown
Technical Details
| Aqi | 160 |
| AqiCategory | Unhealthy |
| StationName | Sofia_Yavorov |
| StationUid | -576160 |
| Sensor Community Pm25Max | 999.59 |
| Sensor Community Pm25Avg | 999.6 |
| Sensor Community SensorCount | 1 |
| Sensor Community AqiCategory | Hazardous |
| Sensor Community ClusterKey | 42.9_23.4 |
| MergedSources | [{"id":"sensor_community_42.8_23.3","source":"sensor_community","severity":"critical","severityValue":86.982,"timestamp":1788495183000,"latitude":42.804,"longitude":23.342},{"id":"sensor_community_42.7_23.3","source":"sensor_community","severity":"critical","severityValue":92.6382,"timestamp":1788495205000,"latitude":42.726,"longitude":23.342},{"id":"sensor_community_42.6_23.3","source":"sensor_community","severity":"critical","severityValue":98.998,"timestamp":1788495189000,"latitude":42.642,"longitude":23.31},{"id":"sensor_community_42.9_23.4","source":"sensor_community","severity":"critical","severityValue":98.9918,"timestamp":1788495198000,"latitude":42.864,"longitude":23.36}] |
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.
Want to know when something happens near Sofia?
Calamity.live data shows a air quality event with CalamityScore 50/100, near Sofia (Bulgaria), based on data from waqi. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.