SmogRank / Czechia / Moravian-Silesian Region / Třinec
Třinec, month by month
Třinec has a measured daily mean on 646 days since 11 January 2023. Its worst month was December 2024, at 75 US AQI (22.0 µg/m³), 194th of 2,616 cities on that month's world ranking. Its cleanest was October 2023, at 49 US AQI (8.9 µg/m³).
Every month since 2023
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
31 months
| Month | Why |
|---|---|
| Oct 2026 | 6 of 12 days measured; a month needs 9. The others: 6 with readings for part of the day (a day needs 18 hours). |
| Sep 2026 | 1 of 30 days measured; a month needs 21. The others: 29 with readings for part of the day (a day needs 18 hours). |
| Aug 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jun 2026 | 4 of 30 days measured; a month needs 21. The others: 26 with under 18 hours of readings or readings that failed our checks. |
| May 2026 | 8 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks. |
| Apr 2026 | 3 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks. |
| Mar 2026 | 2 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks. |
| Feb 2026 | 3 of 28 days measured; a month needs 20. The others: 25 with under 18 hours of readings or readings that failed our checks. |
| Jan 2026 | 9 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks. |
| Dec 2025 | 2 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks. |
| Nov 2025 | 5 of 30 days measured; a month needs 21. The others: 25 with under 18 hours of readings or readings that failed our checks. |
| Oct 2025 | 7 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks. |
| Sep 2025 | 14 of 30 days measured; a month needs 21. The others: 16 with under 18 hours of readings or readings that failed our checks. |
| Aug 2025 | 17 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| Jul 2025 | 8 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks. |
| Jun 2025 | 2 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| May 2025 | 16 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| Apr 2025 | 19 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Mar 2025 | 13 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks. |
| Feb 2025 | 19 of 28 days measured; a month needs 20. The others: 9 with under 18 hours of readings or readings that failed our checks. |
| Jan 2025 | 15 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks. |
| Oct 2024 | 7 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks. |
| Sep 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2024 | 1 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Jun 2024 | 2 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Mar 2024 | 15 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | 21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Apr 2023 | 3 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Jan 2023 | 7 of 31 days measured; a month needs 22. The others: 14 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.
Třinec's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| December 2024 | 7522.0 µg/m³ | 194thof 2,616 | Europe, 24 December 2024 to 3 January 2025 |
| December 2023 | 7521.9 µg/m³ | 127thof 2,247 | Czechia, Slovakia and 2 more countries, December 2023 Europe, December 2023and 1 more |
| February 2023 | 7320.9 µg/m³ | 113thof 1,129 | Europe, 28 February to 4 March 2023 Europe, 6 to 25 February 2023 |
| January 2024 | 7220.6 µg/m³ | 254thof 2,385 | Europe, 8 to 27 January 2024 Eastern Europe, January 2024 |
| November 2024 | 6918.6 µg/m³ | 261stof 2,624 | Europe, November 2024 |
| April 2024 | 5712.5 µg/m³ | 653rdof 2,520 | Poland and Czechia, April 2024 Europe, March and April 2024 |
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.
Třinec's worst days
| Day | US AQI | Episode |
|---|---|---|
| 23 Jan 2026 | 210135.0 µg/m³ | Europe, January and February 2026 |
| 24 Jan 2026 | 202126.5 µg/m³ | Europe, January and February 2026 |
| 7 Dec 2023 | 185104.0 µg/m³ | Europe, December 2023 |
| 9 Jan 2024 | 18299.8 µg/m³ | Europe, 8 to 27 January 2024 |
| 4 Feb 2026 | 17488.3 µg/m³ | Europe, January and February 2026 |
| 11 Feb 2025 | 17082.4 µg/m³ | Europe, 1 to 14 February 2025 |
| 27 Dec 2024 | 16778.8 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 28 Dec 2024 | 16676.3 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 10 Jan 2024 | 16372.5 µg/m³ | Europe, 8 to 27 January 2024 |
| 10 Feb 2025 | 16170.4 µg/m³ | Europe, 1 to 14 February 2025 |
Daily means, the highest since 11 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, Třinec, Czechia, 11 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/trinec/history (accessed 13 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.
Třinec now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 00:07 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).