SmogRank / World / Czechia / August 2025

Most polluted cities in Czechia, August 2025

11 cities in Czechia ranked by their average PM2.5 over the 31 days. Worst: Znojmo at 11.8 µg/m³, #619 of 2,284 cities in the world. Cleanest: Žďár nad Sázavou at 6.0. A city needs measurements on 70% of the days to be ranked.

← Znojmo 11.8
Every city in Czechia ranked for August 2025, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1ZnojmoSouth Moravian
    11.8
  2. 2PraguePrague
    10.9
  3. 3HraniceOlomouc Region
    10.6
  4. 4BrnoSouth Moravian
    9.8
  5. 5České BudějoviceSouth Bohemian Region
    9.7
  6. 6OlomoucOlomouc Region
    9.5
  7. 7ŽideniceSouth Moravian
    9.4
  8. 8Říčanylow-cost sensorsCentral Bohemia
    8.9
  9. 9JihlavaVysocina
    8.2
  10. 10HodonínSouth Moravian
    7.1
  11. 11Žďár nad SázavouVysocina
    6.0
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

All cities in the world, August 2025 · Czechia now

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SmogRank, most polluted cities in Czechia, PM2.5, August 2025, smogrank.com/cz/history/2025-08 (accessed 2 Oct 2026).

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