SmogRank / Countries / Bulgaria / 2025

Most polluted cities in Bulgaria, 2025

8 cities in Bulgaria ranked by their average PM2.5 over the 365 days; 8 above the WHO annual guideline (5.0 µg/m³). Worst: Ruse at 15.2 µg/m³, #237 of 2,131 cities in the world. Cleanest: Gabrovo at 10.5. A city needs measurements on 70% of the days to be ranked.

  1. 1RuseRuse
    15.23.0×
  2. 2Botevgradlow-cost sensorsSofia
    14.32.9×
  3. 3Dimitrovgradlow-cost sensorsHaskovo
    13.92.8×
  4. 4Haskovolow-cost sensorsHaskovo
    13.02.6×
  5. 5SofiaSofia-Capital
    12.72.5×
  6. 6Sevlievolow-cost sensorsGabrovo
    12.62.5×
  7. 7VarnaVarna
    11.02.2×
  8. 8Gabrovolow-cost sensorsGabrovo
    10.52.1×
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, 2025 · Bulgaria now