SmogRank / World / Bulgaria / August 2025

Most polluted cities in Bulgaria, August 2025

8 cities in Bulgaria ranked by their average PM2.5 over the 31 days. Worst: Sofia at 11.4 µg/m³, #827 of 2,503 cities in the world. Cleanest: Gabrovo at 4.8. A city needs measurements on 70% of the days to be ranked.

← Sofia 11.4 µg/m³ 20 µg/m³0
Every city in Bulgaria ranked for August 2025, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1SofiaSofia-Capital
    55
  2. 2RuseRuse
    55
  3. 3VarnaVarna
    44
  4. 4Botevgradlow-cost sensorsSofia
    38
  5. 5Dimitrovgradlow-cost sensorsHaskovo
    38
  6. 6Haskovolow-cost sensorsHaskovo
    34
  7. 7Sevlievolow-cost sensorsGabrovo
    29
  8. 8Gabrovolow-cost sensorsGabrovo
    27
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, August 2025 · Bulgaria now

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SmogRank, most polluted cities in Bulgaria, PM2.5, August 2025, smogrank.com/bg/history/2025-08 (accessed 2 Oct 2026).

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