SmogRank / Countries / Bulgaria / December 2025

Most polluted cities in Bulgaria, December 2025

7 cities in Bulgaria ranked by their average PM2.5 over the 31 days. Worst: Dimitrovgrad at 25.2 µg/m³, #267 of 2,360 cities in the world. Cleanest: Varna at 14.3. A city needs measurements on 70% of the days to be ranked.

  1. 1Dimitrovgradlow-cost sensorsHaskovo
    25.2
  2. 2Haskovolow-cost sensorsHaskovo
    24.1
  3. 3Sevlievolow-cost sensorsGabrovo
    19.2
  4. 4RuseRuse
    17.5
  5. 5Gabrovolow-cost sensorsGabrovo
    16.9
  6. 6SofiaSofia-Capital
    16.6
  7. 7VarnaVarna
    14.3
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, December 2025 · Bulgaria now

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SmogRank, most polluted cities in Bulgaria, PM2.5, December 2025, smogrank.com/bg/history/2025-12 (accessed 2 Oct 2026).

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