SmogRank / Kladno / Prague

Kladno vs Prague: PM2.5 compared

Over the last year, Prague's air was 16% more polluted than Kladno's: PM2.5 averaged 14.7 µg/m³ against 12.7, on the 64 days both cities were measured. Prague had the dirtier air on 48 of those days, Kladno on 16. Prague was over the WHO's daily guideline of 15 µg/m³ on 22 of them, Kladno on 17.

Right now

Kladno#2,429on the 24-hour board of 2,608, at 12 US AQI (2.2 µg/m³)

Prague#2,156on the 24-hour board of 2,608, at 17 US AQI (3.0 µg/m³)

The last year, day by day

Kladno

Prague

Each city's daily mean from 10 Oct 2025 to 9 Oct 2026, one stripe a day, coloured by band. A blank stripe is a day without a daily mean.

Month by month

Monthly means in µg/m³ over the days both cities were measured. Solid: Kladno. Faded: Prague. A month shows once both share 10 such days. Dashed line: the WHO daily guideline, 15 µg/m³.

Year by year

Year	Kladno	Prague	Days both measured	Days Kladno was worse
2026 so far	62	65	37	13
2025	57	60	130	36
2024	58	58	208	94
2023	58	58	243	118

Means in US AQI over the days both cities were measured that year; a year shows once they share 30 such days.

Each city's worst days

Kladno

24 Jan 202613750.2 µg/m³
25 Jan 202611842.5 µg/m³
23 Jan 202610838.3 µg/m³

Prague

25 Jan 202615764.6 µg/m³
24 Jan 202614754.1 µg/m³
22 Jan 202611541.0 µg/m³

Daily means in US AQI, with µg/m³ beside them, since the index stops at its top value, over the days both cities were measured in the last year. Each date opens that day's world board.

Compare either city with another

Kladno

Side by side with Beroun (the nearest), Gujranwala (the world's worst on 30 days).

Prague

Side by side with Gujranwala (the world's worst on 30 days).

Use this page

SmogRank, PM2.5 daily means compared, Kladno and Prague, 10 Oct 2025 – 9 Oct 2026, smogrank.com/compare/cz-kladno/cz-prague (accessed 10 Oct 2026).

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.

The same rules as every SmogRank figure: reference monitors first, and a day counts with 18 measured hours. How we measure.

Updated 2026-10-10 10:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).