SmogRank / World / Czechia / October 2025

Most polluted cities in Czechia, October 2025

No city in Czechia had measurements on 70% of the days, so October 2025 has no board for Czechia.

Low risk1–3
Moderate risk4–6
High risk7–10
Very high risk10+

Canada's AQHI+ for PM2.5 (1 point per 10 µg/m³), which is defined on hourly values. 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, October 2025 · Czechia now