SmogRank / World / Bulgaria / April 2026

Most polluted cities in Bulgaria, April 2026

7 cities in Bulgaria ranked by their average PM2.5 over the 30 days. Worst: Sofia at 12.3 µg/m³, #674 of 2,573 cities in the world. Cleanest: Sevlievo at 4.4. A city needs measurements on 70% of the days to be ranked.

← Sofia 12.3 µg/m³ 20 µg/m³0
Every city in Bulgaria ranked for April 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. 1SofiaSofia-Capital
    20
  2. 2RuseRuse
    17
  3. 3VarnaVarna
    13
  4. 4Dimitrovgradlow-cost sensorsHaskovo
    12
  5. 5Haskovolow-cost sensorsHaskovo
    12
  6. 6Gabrovolow-cost sensorsGabrovo
    10
  7. 7Sevlievolow-cost sensorsGabrovo
    7
Good0–50
Satisfactory51–100
Moderate101–200
Poor201–300
Very poor301–400
Severe401+

India's National Air Quality Index (CPCB), PM2.5 sub-index. 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, April 2026 · Bulgaria now

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SmogRank, most polluted cities in Bulgaria, PM2.5, April 2026, smogrank.com/bg/history/2026-04 (accessed 2 Oct 2026).

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