SmogRank / World / Czechia / May 2026
Most polluted cities in Czechia, May 2026
2 cities in Czechia ranked by their average PM2.5 over the 31 days. Worst: Říčany at 7.4 µg/m³, #1,421 of 2,522 cities in the world. Cleanest: Stodůlky at 6.4. A city needs measurements on 70% of the days to be ranked.
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+
PM2.5 in µg/m³, coloured by the US EPA's PM2.5 categories. 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, May 2026 · Czechia now
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SmogRank, most polluted cities in Czechia, PM2.5, May 2026, smogrank.com/cz/history/2026-05 (accessed 2 Oct 2026).
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