SmogRank / World / Czechia / Central Bohemia / January 2024

Most polluted cities in Central Bohemia, Czechia, January 2024

3 cities in Central Bohemia, Czechia ranked by their average PM2.5 over the 31 days. Worst: Beroun at 26.6 µg/m³, #153 of 2,341 cities in the world. Cleanest: Mladá Boleslav at 18.8. A city needs measurements on 70% of the days to be ranked.

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.

← Beroun 23% 20%0
Every city in Central Bohemia, Czechia ranked for January 2024, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Beroun
    23%
  2. 2Kladno
    17%
  3. 3Mladá Boleslav
    13%
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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

All cities in the world, January 2024 · All cities in Czechia, January 2024 · Central Bohemia now

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SmogRank, most polluted cities in Central Bohemia, Czechia, PM2.5, January 2024, smogrank.com/cz/region/central-bohemia/history/2024-01 (accessed 6 Oct 2026).

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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.