SmogRank / Czechia / Carlsbad Region / Sokolov

Sokolov, month by month

Sokolov has a measured daily mean on 687 days since 1 January 2023. Its worst month was January 2024, at 58 US AQI (12.9 µg/m³), 610th of 2,385 cities on that month's world ranking. Its cleanest was April 2024, at 33 US AQI (6.0 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 200)41 days measured
Jan10 daysFeb3 daysMar3 daysApr3 daysMay11 daysJun4 daysJulnoneAugnoneSep1 dayOct6 days
2025too few days for a mean (a year needs 256)133 days measured
Jan12 daysFeb13 daysMar11 daysApr16 daysMay12 daysJun1 dayJul7 daysAug16 daysSep10 daysOct8 daysNov9 daysDec18 days
2024too few days for a mean (a year needs 257)214 days measured
Jan58#610Feb37#1,575Mar15 daysApr33#1,678May34#1,978JunnoneJul34#1,925Aug1 daySepnoneOct8 daysNov53#809Dec45#1,333
202351 for the year299 days measured621st of 1,355 in the world
Jan46#660Feb55#586Mar46#450Apr48#671May52#561Jun54#709Jul47#817Aug48#862Sep49#838Oct51#445Nov15 daysDec53#626
Each square is a month's mean PM2.5 in US AQI from Sokolov'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 Sokolov 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

28 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 20264 of 30 days measured; a month needs 21. The others: 26 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 20263 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks.
Mar 20263 of 31 days measured; a month needs 22. The others: 28 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 202518 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Nov 20259 of 30 days measured; a month needs 21. The others: 21 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 202510 of 30 days measured; a month needs 21. The others: 20 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 202512 of 31 days measured; a month needs 22. The others: 19 with under 18 hours of readings or readings that failed our checks.
Apr 202516 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks.
Mar 202511 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Feb 202513 of 28 days measured; a month needs 20. The others: 15 with under 18 hours of readings or readings that failed our checks.
Jan 202512 of 31 days measured; a month needs 22. The others: 19 with under 18 hours of readings or readings that failed our checks.
Oct 20248 of 31 days measured; a month needs 22. The others: 23 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.
Nov 202315 of 30 days measured; a month needs 21. The others: 15 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.

Sokolov's worst months

MonthUS AQIDays measuredWorld rankEpisode
January 2024 5812.9 µg/m³26 of 31610thof 2,385Europe, 8 to 27 January 2024
February 2023 5511.3 µg/m³27 of 28586thof 1,129Europe, 6 to 25 February 2023
June 2023 5410.5 µg/m³29 of 30709thof 1,603–
December 2023 5310.4 µg/m³24 of 31626thof 2,247Europe, December 2023
November 2024 5310.2 µg/m³26 of 30809thof 2,624Europe, November 2024
May 2023 529.4 µg/m³29 of 31561stof 1,600–

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.

Sokolov's worst days

DayUS AQIEpisode
9 Nov 2024 11641.7 µg/m³Europe, November 2024
23 Jan 2026 9834.5 µg/m³Europe, January and February 2026
22 Feb 2025 9834.1 µg/m³Europe, 14 February to 1 March 2025
9 Feb 2025 9734.0 µg/m³Europe, 1 to 14 February 2025
8 Feb 2025 9633.1 µg/m³Europe, 1 to 14 February 2025
31 Mar 2024 9432.3 µg/m³Europe, March and April 2024
10 Feb 2023 9432.1 µg/m³Europe, 6 to 25 February 2023
8 Nov 2024 9331.8 µg/m³Europe, November 2024
12 Nov 2025 9231.0 µg/m³–
22 Jan 2026 9130.4 µg/m³Europe, January and February 2026

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, Sokolov, 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/sokolov/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.

Sokolov 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).