SmogRank / Countries / Bulgaria / October 2025

Most polluted cities in Bulgaria, October 2025

5 cities in Bulgaria ranked by their average PM2.5 over the 31 days. Worst: Botevgrad at 12.3 µg/m³, #315 of 2,110 cities in the world. Cleanest: Gabrovo at 7.8. A city needs measurements on 70% of the days to be ranked.

  1. 1Botevgradlow-cost sensorsSofia
    12.3
  2. 2Dimitrovgradlow-cost sensorsHaskovo
    9.7
  3. 3Sevlievolow-cost sensorsGabrovo
    9.6
  4. 4Haskovolow-cost sensorsHaskovo
    8.6
  5. 5Gabrovolow-cost sensorsGabrovo
    7.8
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

All cities in the world, October 2025 · Bulgaria now