SmogRank / Countries / Bulgaria / February 2026

Most polluted cities in Bulgaria, February 2026

7 cities in Bulgaria ranked by their average PM2.5 over the 28 days. Worst: Ruse at 20.4 µg/m³, #322 of 2,251 cities in the world. Cleanest: Varna at 9.3. A city needs measurements on 70% of the days to be ranked.

  1. 1RuseRuse
    20.4
  2. 2Dimitrovgradlow-cost sensorsHaskovo
    16.2
  3. 3Gabrovolow-cost sensorsGabrovo
    16.0
  4. 4Haskovolow-cost sensorsHaskovo
    15.9
  5. 5SofiaSofia-Capital
    14.4
  6. 6Sevlievolow-cost sensorsGabrovo
    13.6
  7. 7VarnaVarna
    9.3
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, February 2026 · Bulgaria now