SmogRank / World / Bulgaria / October 2026

Most polluted cities in Bulgaria, October 2026

10 cities in Bulgaria ranked by their average PM2.5 so far (1 of 31 days). Worst: Ruse at 11.0 µg/m³, #874 of 2,606 cities in the world. Cleanest: Haskovo at 4.6. A city needs measurements on 70% of the days to be ranked.

← Ruse 11.0 µg/m³ 20 µg/m³0
Every city in Bulgaria ranked for October 2026, 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. 1RuseRuse
    55
  2. 2SofiaSofia-Capital
    41
  3. 3Gabrovolow-cost sensorsGabrovo
    40
  4. 4Sevlievolow-cost sensorsGabrovo
    39
  5. 5VarnaVarna
    38
  6. 6Svishtovlow-cost sensorsVeliko Tarnovo
    36
  7. 7Dimitrovgradlow-cost sensorsHaskovo
    33
  8. 8Gorna Oryahovitsalow-cost sensorsVeliko Tarnovo
    32
  9. 9Veliko Tŭrnovolow-cost sensorsVeliko Tarnovo
    31
  10. 10Haskovolow-cost sensorsHaskovo
    26
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, October 2026 · Bulgaria now

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SmogRank, most polluted cities in Bulgaria, PM2.5, October 2026 (so far), smogrank.com/bg/history/2026-10 (accessed 2 Oct 2026).

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