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
    12.3
  2. 2RuseRuse
    9.5
  3. 3VarnaVarna
    8.0
  4. 4Dimitrovgradlow-cost sensorsHaskovo
    7.0
  5. 5Haskovolow-cost sensorsHaskovo
    6.8
  6. 6Gabrovolow-cost sensorsGabrovo
    6.0
  7. 7Sevlievolow-cost sensorsGabrovo
    4.4
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, 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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