SmogRank / Poland / Silesia / Cieszyn

Cieszyn, month by month

Cieszyn has a measured daily mean on 693 days since 1 January 2023. Its worst month was December 2023, at 81 US AQI (25.0 µg/m³), 95th of 2,247 cities on that month's world ranking. Its cleanest was May 2024, at 54 US AQI (10.5 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 199)34 days measured
Jan9 daysFeb3 daysMar1 dayApr2 daysMay9 daysJun4 daysJulnoneAugnoneSep1 dayOct5 days
2025too few days for a mean (a year needs 256)109 days measured
Jan13 daysFeb14 daysMar10 daysApr9 daysMay9 daysJunnoneJul5 daysAug13 daysSep16 daysOct7 daysNov8 daysDec5 days
2024too few days for a mean (a year needs 257)215 days measured
Jan72#260Feb58#407Mar15 daysApr59#567May54#682JunnoneJul57#402Aug1 daySepnoneOct6 daysNov71#231Dec75#201
202364 for the year335 days measured106th of 1,355 in the world
Jan68#174Feb75#92Mar66#53Apr68#132May62#144Jun60#433Jul56#402Aug58#281Sep61#195Oct54#268Nov54#485Dec81#95
Each square is a month's mean PM2.5 in US AQI from Cieszyn'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 Cieszyn 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

27 months
MonthWhy
Oct 20265 of 11 days measured; a month needs 8. 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 20269 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks.
Apr 20262 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks.
Mar 20261 of 31 days measured; a month needs 22. The others: 30 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 20269 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks.
Dec 20255 of 31 days measured; a month needs 22. The others: 26 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 20257 of 31 days measured; a month needs 22. The others: 24 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 202513 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks.
Jul 20255 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks.
Jun 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 20259 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks.
Apr 20259 of 30 days measured; a month needs 21. The others: 21 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 202514 of 28 days measured; a month needs 20. The others: 14 with under 18 hours of readings or readings that failed our checks.
Jan 202513 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks.
Oct 20246 of 31 days measured; a month needs 22. The others: 25 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.

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

Cieszyn's worst months

MonthUS AQIDays measuredWorld rankEpisode
December 2023 8125.0 µg/m³28 of 3195thof 2,247Czechia, Slovakia and 2 more countries, December 2023
Europe, December 2023and 1 more
February 2023 7521.8 µg/m³28 of 2892ndof 1,129Europe, 28 February to 4 March 2023
Europe, 6 to 25 February 2023
December 2024 7521.8 µg/m³24 of 31201stof 2,616Europe, 24 December 2024 to 3 January 2025
January 2024 7220.4 µg/m³31 of 31260thof 2,385Europe, 8 to 27 January 2024
Eastern Europe, January 2024
November 2024 7119.6 µg/m³25 of 30231stof 2,624Europe, November 2024
Eastern Europe, October and November 2024
April 2023 6818.3 µg/m³29 of 30132ndof 1,622Europe, April 2023

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.

Cieszyn's worst days

DayUS AQIEpisode
23 Jan 2026 217142.0 µg/m³Europe, January and February 2026
28 Dec 2024 192114.0 µg/m³Europe, 24 December 2024 to 3 January 2025
8 Dec 2023 184103.0 µg/m³Europe, December 2023
24 Jan 2026 183101.0 µg/m³Europe, January and February 2026
22 Jan 2026 17995.0 µg/m³Europe, January and February 2026
7 Dec 2023 17791.9 µg/m³Europe, December 2023
6 Dec 2023 17590.3 µg/m³Europe, December 2023
25 Jan 2026 17183.8 µg/m³Europe, January and February 2026
18 Jan 2026 17082.8 µg/m³Europe, January and February 2026
10 Jan 2024 16981.0 µg/m³Europe, 8 to 27 January 2024

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, Cieszyn, Poland, 1 Jan 2023 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/pl/cieszyn/history (accessed 12 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.

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

Updated 2026-10-12 20:07 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).