SmogRank / World / Bulgaria / May 2026

Most polluted cities in Bulgaria, May 2026

10 cities in Bulgaria ranked by their average PM2.5 over the 31 days. Worst: Sofia at 9.8 µg/m³, #506 of 2,237 cities in the world. Cleanest: Sevlievo at 2.9. A city needs measurements on 70% of the days to be ranked.

← Sofia 9.8
Every city in Bulgaria ranked for May 2026, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1SofiaSofia-Capital
    9.8
  2. 2VarnaVarna
    8.9
  3. 3RuseRuse
    8.7
  4. 4Dimitrovgradlow-cost sensorsHaskovo
    5.3
  5. 5Haskovolow-cost sensorsHaskovo
    4.6
  6. 6Svishtovlow-cost sensorsVeliko Tarnovo
    4.3
  7. 7Gabrovolow-cost sensorsGabrovo
    4.2
  8. 8Veliko Tŭrnovolow-cost sensorsVeliko Tarnovo
    3.9
  9. 9Gorna Oryahovitsalow-cost sensorsVeliko Tarnovo
    3.4
  10. 10Sevlievolow-cost sensorsGabrovo
    2.9
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, May 2026 · Bulgaria now

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SmogRank, most polluted cities in Bulgaria, PM2.5, May 2026, smogrank.com/bg/history/2026-05 (accessed 2 Oct 2026).

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