Right now
The most recent data we hold from World Air Quality Index arrived 44 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 the 15th strongest of the 37 detections recorded within 20 km of this point since 14 March 2026. The last comparable one was on 10 September 2026. 7 more were recorded here in the fortnight before it.
What the source measured
World Air Quality Index reported: AQI 155 (Unhealthy) at Sofia_Boyana
The air quality index read 155 (Unhealthy) at the Sofia_Boyana station.
Nearby, since 14 March 2026
- August 23, 2026 · score 14 · 3.2 km
- September 10, 2026 · score 36 · 4.3 km
- September 6, 2026 · score 43 · 4.3 km
How we know
Confirmed by 2 independent sources, including World Air Quality Index.
Our own score for this event is 29 out of 100, at 47 % 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) | 29 / 100 |
| Our confidence | 47% |
| Coordinates | 42.6455, 23.2675 |
| Nearest City | Sofia (7 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-12T03:45:41.000Z |
| Source | https://aqicn.org/city/@-576499 |
Score Breakdown
Technical Details
| Aqi | 155 |
| AqiCategory | Unhealthy |
| StationName | Sofia_Boyana |
| StationUid | -576499 |
| Sensor Community Pm25Max | 999.9 |
| Sensor Community Pm25Avg | 999.9 |
| 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":"high","severityValue":66.917,"timestamp":1789184569000,"latitude":42.804,"longitude":23.342},{"id":"sensor_community_42.7_23.3","source":"sensor_community","severity":"critical","severityValue":92.7848,"timestamp":1789184602000,"latitude":42.726,"longitude":23.342},{"id":"sensor_community_42.6_23.3","source":"sensor_community","severity":"critical","severityValue":98.998,"timestamp":1789184616000,"latitude":42.642,"longitude":23.31},{"id":"sensor_community_42.9_23.4","source":"sensor_community","severity":"critical","severityValue":98.998,"timestamp":1789184632000,"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.
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