SmogRank / World / Czechia / April 2023

Most polluted cities in Czechia, April 2023

25 cities in Czechia ranked by their average PM2.5 over the 30 days. Worst: Havířov at 19.7 µg/m³, #62 of 1,316 cities in the world. Cleanest: Sokolov at 8.7. 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.

← Havířov 19.7 µg/m³ 20 µg/m³0
Every city in Czechia ranked for April 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. 1HavířovMoravian-Silesian Region
    71
  2. 2BohumínMoravian-Silesian Region
    70
  3. 3Český TěšínMoravian-Silesian Region
    68
  4. 4Frýdek-MístekMoravian-Silesian Region
    67
  5. 5OstravaMoravian-Silesian Region
    67
  6. 6Valašské MeziříčíZlín
    65
  7. 7DěčínÚstí nad Labem Region
    64
  8. 8OlomoucOlomouc Region
    60
  9. 9BerounCentral Bohemia
    60
  10. 10ZnojmoSouth Moravian
    59
  11. 11MostÚstí nad Labem Region
    59
  12. 12ZlínZlín
    59
  13. 13Hradec KrálovéHradec Králové Region
    58
  14. 14KladnoCentral Bohemia
    57
  15. 15LiberecLiberec Region
    57
  16. 16PraguePrague
    56
  17. 17ŽideniceSouth Moravian
    56
  18. 18LitvínovÚstí nad Labem Region
    55
  19. 19PilsenPlzeň Region
    55
  20. 20Mladá BoleslavCentral Bohemia
    55
  21. 20KadaňÚstí nad Labem Region
    55
  22. 22Ústí nad LabemÚstí nad Labem Region
    54
  23. 23České BudějoviceSouth Bohemian Region
    54
  24. 23BrnoSouth Moravian
    54
  25. 25SokolovCarlsbad Region
    48
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, April 2023 · Czechia now

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

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