SmogRank / World / Bulgaria / September 2026

Most polluted cities in Bulgaria, September 2026

11 cities in Bulgaria ranked by their average PM2.5 over the 30 days. Worst: Ruse at 9.2 µg/m³, #768 of 2,646 cities in the world. Cleanest: Sevlievo at 3.2. A city needs measurements on 70% of the days to be ranked.

← Ruse 9.2 µg/m³ 20 µg/m³0
Every city in Bulgaria ranked for September 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
    9.2
  2. 2SofiaSofia-Capital
    7.8
  3. 3VarnaVarna
    6.9
  4. 4Dimitrovgradlow-cost sensorsHaskovo
    5.3
  5. 4Botevgradlow-cost sensorsSofia
    5.3
  6. 6Veliko Tŭrnovolow-cost sensorsVeliko Tarnovo
    5.0
  7. 7Haskovolow-cost sensorsHaskovo
    4.3
  8. 8Svishtovlow-cost sensorsVeliko Tarnovo
    4.2
  9. 9Gabrovolow-cost sensorsGabrovo
    4.0
  10. 10Gorna Oryahovitsalow-cost sensorsVeliko Tarnovo
    3.6
  11. 11Sevlievolow-cost sensorsGabrovo
    3.2
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

PM2.5 in µg/m³, coloured by the US EPA's PM2.5 categories. 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, September 2026 · Bulgaria now

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SmogRank, most polluted cities in Bulgaria, PM2.5, September 2026, smogrank.com/bg/history/2026-09 (accessed 2 Oct 2026).

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