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
    1
  2. 2SofiaSofia-Capital
    1
  3. 3VarnaVarna
    1
  4. 4Dimitrovgradlow-cost sensorsHaskovo
    1
  5. 4Botevgradlow-cost sensorsSofia
    1
  6. 6Veliko Tŭrnovolow-cost sensorsVeliko Tarnovo
    1
  7. 7Haskovolow-cost sensorsHaskovo
    1
  8. 8Svishtovlow-cost sensorsVeliko Tarnovo
    1
  9. 9Gabrovolow-cost sensorsGabrovo
    1
  10. 10Gorna Oryahovitsalow-cost sensorsVeliko Tarnovo
    1
  11. 11Sevlievolow-cost sensorsGabrovo
    1
Low1–3
Moderate4–6
High7–9
Very high10

The UK's Daily Air Quality Index (1 to 10), PM2.5 bands. 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

Use this board

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

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.