SmogRank / World / Czechia / March 2023

Most polluted cities in Czechia, March 2023

25 cities in Czechia ranked by their average PM2.5 over the 31 days. Worst: Bohumín at 21.7 µg/m³, #16 of 947 cities in the world. Cleanest: Sokolov at 8.3. A city needs measurements on 70% of the days to be ranked.

OpenAQ's archive, where our readings come from, has almost none for 20 of these 31 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; many cities elsewhere are missing from this board, not clean. Why.

← Bohumín 21.7 µg/m³ 20 µg/m³0
Every city in Czechia ranked for March 2023, 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. 1BohumínMoravian-Silesian Region
    74
  2. 2Frýdek-MístekMoravian-Silesian Region
    70
  3. 3HavířovMoravian-Silesian Region
    69
  4. 4DěčínÚstí nad Labem Region
    68
  5. 5Valašské MeziříčíZlín
    68
  6. 6Český TěšínMoravian-Silesian Region
    66
  7. 7OstravaMoravian-Silesian Region
    65
  8. 8BerounCentral Bohemia
    64
  9. 9OlomoucOlomouc Region
    63
  10. 10ZlínZlín
    62
  11. 11ZnojmoSouth Moravian
    61
  12. 12ŽideniceSouth Moravian
    60
  13. 12Hradec KrálovéHradec Králové Region
    60
  14. 14Ústí nad LabemÚstí nad Labem Region
    59
  15. 14MostÚstí nad Labem Region
    59
  16. 14LitvínovÚstí nad Labem Region
    59
  17. 17BrnoSouth Moravian
    58
  18. 18Mladá BoleslavCentral Bohemia
    58
  19. 19České BudějoviceSouth Bohemian Region
    58
  20. 20KadaňÚstí nad Labem Region
    57
  21. 21PraguePrague
    57
  22. 22KladnoCentral Bohemia
    56
  23. 23LiberecLiberec Region
    55
  24. 24PilsenPlzeň Region
    55
  25. 25SokolovCarlsbad Region
    46
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). 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, March 2023 · Czechia now

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SmogRank, most polluted cities in Czechia, PM2.5, March 2023, smogrank.com/cz/history/2023-03 (accessed 2 Oct 2026).

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