SmogRank / Countries / Czechia / December 2025

Most polluted cities in Czechia, December 2025

5 cities in Czechia ranked by their average PM2.5 over the 31 days. Worst: Stodůlky at 40.6 µg/m³, #191 of 2,360 cities in the world. Cleanest: Židenice at 11.0. A city needs measurements on 70% of the days to be ranked.

  1. 1Stodůlkylow-cost sensorsPrague
    40.6
  2. 2Říčanylow-cost sensorsCentral Bohemia
    21.9
  3. 3BrnoSouth Moravian
    13.0
  4. 4PraguePrague
    12.0
  5. 5ŽideniceSouth Moravian
    11.0
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, December 2025 · Czechia now