SmogRank / Czechia / Central Bohemia / Kladno

Kladno, month by month

Kladno has a measured daily mean on 627 days since 1 January 2023. Its worst month was January 2024, at 70 US AQI (19.5 µg/m³), 288th of 2,385 cities on that month's world ranking. Its cleanest was July 2024, at 48 US AQI (8.7 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 200)40 days measured
Jan10 daysFeb3 daysMar2 daysApr4 daysMay11 daysJun3 daysJulnoneAugnoneSep1 dayOct6 days
2025too few days for a mean (a year needs 256)130 days measured
Jan14 daysFeb15 daysMar10 daysApr13 daysMay11 daysJun1 dayJul7 daysAug16 daysSep16 daysOct8 daysNov8 daysDec11 days
2024too few days for a mean (a year needs 257)208 days measured
Jan70#288Feb48#910Mar15 daysApr51#1,132May55#595JunnoneJul48#1,103Aug1 daySepnoneOct9 daysNov61#430Dec60#536
2023too few days for a mean (a year needs 256)249 days measured
Jan54#407Feb62#350Mar56#160Apr57#240May58#212Jun56#550Jul20 daysAug16 daysSep57#293Oct18 daysNov9 daysDec10 days
Each square is a month's mean PM2.5 in US AQI from Kladno's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Kladno marked; each year, the year's.
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

Months without a mean, and why

32 months
MonthWhy
Oct 20266 of 12 days measured; a month needs 9. The others: 6 with readings for part of the day (a day needs 18 hours).
Sep 20261 of 30 days measured; a month needs 21. The others: 29 with readings for part of the day (a day needs 18 hours).
Aug 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 20263 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks.
May 202611 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Apr 20264 of 30 days measured; a month needs 21. The others: 26 with under 18 hours of readings or readings that failed our checks.
Mar 20262 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Feb 20263 of 28 days measured; a month needs 20. The others: 25 with under 18 hours of readings or readings that failed our checks.
Jan 202610 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Dec 202511 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Nov 20258 of 30 days measured; a month needs 21. The others: 22 with under 18 hours of readings or readings that failed our checks.
Oct 20258 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks.
Sep 202516 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks.
Aug 202516 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Jul 20257 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks.
Jun 20251 of 30 days measured; a month needs 21. The others: 29 with under 18 hours of readings or readings that failed our checks.
May 202511 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Apr 202513 of 30 days measured; a month needs 21. The others: 17 with under 18 hours of readings or readings that failed our checks.
Mar 202510 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Feb 202515 of 28 days measured; a month needs 20. The others: 13 with under 18 hours of readings or readings that failed our checks.
Jan 202514 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Oct 20249 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks.
Sep 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 20241 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Jun 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 202415 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Dec 202310 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Nov 20239 of 30 days measured; a month needs 21. The others: 21 with under 18 hours of readings or readings that failed our checks.
Oct 202318 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Aug 202316 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Jul 202320 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Kladno's worst months

MonthUS AQIDays measuredWorld rankEpisode
January 2024 7019.5 µg/m³24 of 31288thof 2,385Europe, 27 January to 2 February 2024
Europe, 28 to 31 January 2024and 1 more
February 2023 6214.9 µg/m³25 of 28350thof 1,129Europe, 28 February to 4 March 2023
Europe, 6 to 25 February 2023
November 2024 6114.6 µg/m³24 of 30430thof 2,624Europe, November 2024
December 2024 6013.9 µg/m³24 of 31536thof 2,616Europe, 24 December 2024 to 3 January 2025
May 2023 5813.0 µg/m³27 of 31212thof 1,600Czechia and Germany, May 2023
April 2023 5712.5 µg/m³22 of 30240thof 1,622–

Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.

Kladno's worst days

DayUS AQIEpisode
31 Mar 2024 14653.6 µg/m³Europe, March and April 2024
24 Jan 2026 13750.2 µg/m³Europe, January and February 2026
9 Nov 2024 13649.7 µg/m³Europe, November 2024
10 Jan 2024 13047.3 µg/m³Europe, 8 to 27 January 2024
27 Dec 2024 12444.7 µg/m³Europe, 24 December 2024 to 3 January 2025
10 Feb 2025 12244.2 µg/m³Europe, 1 to 14 February 2025
31 Jan 2024 12243.9 µg/m³Europe, 27 January to 2 February 2024
Europe, 28 to 31 January 2024
11 Jan 2024 11943.0 µg/m³Europe, 8 to 27 January 2024
25 Jan 2026 11842.5 µg/m³Europe, January and February 2026
10 Mar 2025 11742.2 µg/m³Germany, Poland and 25 more countries, March 2025

Daily means, the highest since 1 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.

Use this history

SmogRank, PM2.5 monthly and daily means, Kladno, Czechia, 1 Jan 2023 – 12 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/cz/kladno/history (accessed 13 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.

Kladno now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-13 01:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). 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).