SmogRank / World / Europe / Czechia / Central Bohemia
Most polluted cities in Central Bohemia, Czechia
1 measured city, this year; 1 above the WHO annual guideline. The only one: Říčany at 15.9 µg/m³, #507 in the world.
47 monitors in Czechia stopped reporting on 6 Oct, 12:00 local time. Cities that rely on them are missing from the 24-hour board and may drop from the longer ones; that isn't clean air, and they return when the data does.
Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.
Cities coloured by their PM2.5 over the last 24 hours. Fires, smoke and ash: Oct 5, the newest UTC day mapped.
- 1Říčanylow-cost sensors 17%
Low-cost sensors: consumer units, counted only in cities with no government-grade monitor; they read close to reference monitors on the whole, but 15 to 25% high in humid air. How we use them.
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
Estimated: cities without a monitor
Central Bohemia cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| Kolín | ≈ 16 µg/m³ |
| Příbram | ≈ 19 µg/m³ |
| Kutná Hora | ≈ 17 µg/m³ |
| Brandýs nad Labem-Stará Boleslav | ≈ 21 µg/m³ |
| Mělník | ≈ 19 µg/m³ |
| Kralupy nad Vltavou | ≈ 18 µg/m³ |
| Slaný | ≈ 21 µg/m³ |
| Benešov | ≈ 14 µg/m³ |
| Neratovice | ≈ 19 µg/m³ |
| Nymburk | ≈ 17 µg/m³ |
| Rakovník | ≈ 17 µg/m³ |
| Poděbrady | ≈ 17 µg/m³ |
Bad-air episodes in Central Bohemia
- Europe, June 202630 June 2026, 1 day14 cities31 µg/m³peak, Târgu Mureş
- Slovakia, Czechia and Poland, June 202627 to 28 June 2026, 2 days18 cities33 µg/m³peak, Krompachy
- Eastern Europe, 15 to 17 April 20263 days25 cities44 µg/m³peak, Szeged
- Eastern Europe, 10 to 12 April 20263 days36 cities60 µg/m³peak, Radomsko
- Europe, 1 to 12 March 202612 days532 cities109 µg/m³peak, Radomsko
- Germany, Poland and Czechia, February 202617 to 18 February 2026, 2 days67 cities91 µg/m³peak, Kalisz
Times when many cities around here had PM2.5 at twice their usual or more on the same days.
Use this board
SmogRank, most polluted cities in Central Bohemia, Czechia, PM2.5, this year to 6 Oct 2026, 23:00 UTC, smogrank.com/cz/region/central-bohemia?w=year.
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
Updated 2026-10-06 23:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.