SmogRank / World / Bulgaria / April 2023

Most polluted cities in Bulgaria, April 2023

6 cities in Bulgaria ranked by their average PM2.5 over the 30 days. Worst: Ruse at 13.5 µg/m³, #131 of 1,316 cities in the world. Cleanest: Dimitrovgrad at 9.5. A city needs measurements on 70% of the days to be ranked.

OpenAQ's archive, where our readings come from, has almost none for 3 of these 30 days. Cities in the United States and Europe have them from the EPA's and the European Environment Agency's own records of the same monitors; elsewhere a city's average is over its other days. Why.

← Ruse 13.5
Every city in Bulgaria ranked for April 2023, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1RuseRuse
    23
  2. 2Botevgradlow-cost sensorsSofia
    22
  3. 3Sevlievolow-cost sensorsGabrovo
    17
  4. 4Haskovolow-cost sensorsHaskovo
    17
  5. 5Gabrovolow-cost sensorsGabrovo
    17
  6. 6Dimitrovgradlow-cost sensorsHaskovo
    17
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 2023 · Bulgaria now

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SmogRank, most polluted cities in Bulgaria, PM2.5, April 2023, smogrank.com/bg/history/2023-04 (accessed 2 Oct 2026).

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