SmogRank / Countries / Bulgaria / 2026

Most polluted cities in Bulgaria, 2026

7 cities in Bulgaria ranked by their average PM2.5 so far (273 of 365 days); 7 above the WHO annual guideline (5.0 µg/m³). Worst: Ruse at 13.1 µg/m³, #382 of 2,181 cities in the world. Cleanest: Sevlievo at 7.4. A city needs measurements on 70% of the days to be ranked.

  1. 1RuseRuse
    13.12.6×
  2. 2SofiaSofia-Capital
    11.32.3×
  3. 3Dimitrovgradlow-cost sensorsHaskovo
    10.02.0×
  4. 4VarnaVarna
    9.71.9×
  5. 5Haskovolow-cost sensorsHaskovo
    9.11.8×
  6. 6Gabrovolow-cost sensorsGabrovo
    8.51.7×
  7. 7Sevlievolow-cost sensorsGabrovo
    7.41.5×
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, 2026 · Bulgaria now