Calamity
CriticalAir QualityCS: 29 · v5

Air Quality near Sofia

BulgariaWorld Air Quality Index

Right now

The most recent data we hold from World Air Quality Index arrived 4 hours ago, and this point is in it.

2 other detections within 20 km in the last 24 hours, the nearest 7 km from here.

Reported by World Air Quality Index today.

It is the 17th strongest of the 39 detections recorded within 20 km of this point since 14 March 2026. Another comparable one was recorded here earlier the same day. 10 more were recorded here in the fortnight before it.

What the source measured

World Air Quality Index reported: AQI 167 (Unhealthy) at Balkanity_Hut

The air quality index read 167 (Unhealthy) at the Balkanity_Hut station.

Nearby, since 14 March 2026

How we know

2 recorded sources include World Air Quality Index; independence is not established by this count.

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

TypeAir Quality
SeverityCritical
Calamity Score (ours)29 / 100
Legacy data-support index0.46/1
Coordinates42.6151, 23.2347
Nearest CitySofia (12 km)
Urban exposure index (PEI)0 within 5 km
Impact Tierminor
Timestamp2026-09-18T15:35:42.000Z
Sourcehttps://aqicn.org/city/@-576211

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: 2026-09-18T15:35:42.000Z.

First archived: 2026-09-18T15:47:38.405Z. Material modification: not recorded.

Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.

  1. 2026-09-18T19:25:34.612Z · data_change

    Index 29 → 29; severity critical → critical; version 5 → 5.

  2. 2026-09-18T18:52:52.325Z · data_change

    Index 29 → 29; severity critical → critical; version 5 → 5.

  3. 2026-09-18T18:19:31.036Z · data_change

    Index 29 → 29; severity critical → critical; version 5 → 5.

  4. 2026-09-18T17:52:40.441Z · data_change

    Index 29 → 29; severity critical → critical; version 5 → 5.

  5. 2026-09-18T17:20:02.453Z · data_change

    Index 29 → 29; severity critical → critical; version 5 → 5.

  6. 2026-09-18T16:47:30.049Z · data_change

    Index 29 → 29; severity critical → critical; version 5 → 5.

  7. 2026-09-18T16:14:57.429Z · data_change

    Index 29 → 29; severity critical → critical; version 5 → 5.

Score Breakdown

65
intensity
0
Urban PEI term
0
Scenario weight
33
Recorded reference / batch anomaly

Technical Details

Aqi167
AqiCategoryUnhealthy
StationNameBalkanity_Hut
StationUid-576211
Sensor Community Pm25Max999.9
Sensor Community Pm25Avg999.9
Sensor Community SensorCount1
Sensor Community AqiCategoryHazardous
Sensor Community AqiCategoryVersionUS-EPA-PM25-2024-05-06
Sensor Community MeasurementUnitug/m3
Sensor Community AveragingPeriod24h
Sensor Community Aggregationmaximum of selected sensor 24h means; average covers selected sensors only
Sensor Community SelectionThreshold55
Sensor Community ClusterKey42.9_23.4
MergedSources[{"id":"sensor_community_42.8_23.3","source":"sensor_community","severity":"critical","severityValue":95,"timestamp":1789758794000,"latitude":42.804,"longitude":23.342},{"id":"sensor_community_42.7_23.3","source":"sensor_community","severity":"critical","severityValue":95,"timestamp":1789758808000,"latitude":42.726,"longitude":23.342},{"id":"sensor_community_42.5_23.0","source":"sensor_community","severity":"medium","severityValue":65,"timestamp":1789758809000,"latitude":42.548,"longitude":22.968},{"id":"sensor_community_42.6_23.3","source":"sensor_community","severity":"critical","severityValue":95,"timestamp":1789758897000,"latitude":42.642,"longitude":23.31},{"id":"sensor_community_42.9_23.4","source":"sensor_community","severity":"critical","severityValue":95,"timestamp":1789758827000,"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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