SmogRank / Poland / Silesia / Bielsko-Biala
Bielsko-Biala, month by month
Bielsko-Biala has a measured daily mean on 845 days since 1 January 2023. Its worst month was February 2025, at 146 US AQI (53.6 µg/m³), 36th of 2,633 cities on that month's world ranking. Its cleanest was September 2026, at 53 US AQI (10.2 µg/m³). 2025 averaged 76 US AQI (22.3 µg/m³), against 71 US AQI (19.7 µg/m³) in 2024.
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
21 months
| Month | Why |
|---|---|
| Oct 2026 | 6 of 12 days measured; a month needs 9. The others: 2 with no readings from the monitor, 4 with readings for part of the day (a day needs 18 hours). |
| Aug 2026 | 19 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | 15 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks. |
| Jun 2026 | 12 of 30 days measured; a month needs 21. The others: 18 with under 18 hours of readings or readings that failed our checks. |
| May 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Apr 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. |
| Mar 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Feb 2026 | 7 of 28 days measured; a month needs 20. The others: 21 with under 18 hours of readings or readings that failed our checks. |
| Jan 2026 | 7 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks. |
| Dec 2025 | 12 of 31 days measured; a month needs 22. The others: 19 with under 18 hours of readings or readings that failed our checks. |
| Nov 2025 | 16 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| Oct 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. |
| Jul 2025 | 1 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Dec 2023 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Nov 2023 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Oct 2023 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Sep 2023 | 4 of 30 days measured; a month needs 21. The others: 26 with under 18 hours of readings or readings that failed our checks. |
| Aug 2023 | 1 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | 2 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks. |
| Jun 2023 | 11 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks. |
| May 2023 | 17 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.
Bielsko-Biala's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2025 | 14653.6 µg/m³ | 36thof 2,633 | Europe, 14 February to 1 March 2025 Europe, 1 to 14 February 2025 |
| December 2024 | 9734.0 µg/m³ | 66thof 2,616 | Europe, 24 December 2024 to 3 January 2025 Eastern Europe, 30 November to 8 December 2024 |
| January 2024 | 9331.7 µg/m³ | 107thof 2,385 | Europe, 8 to 27 January 2024 Eastern Europe, January 2024 |
| February 2023 | 9130.5 µg/m³ | 24thof 1,129 | Europe, 28 February to 4 March 2023 Europe, 6 to 25 February 2023 |
| January 2025 | 8829.2 µg/m³ | 101stof 2,474 | Germany, France and 19 more countries, January 2025 Poland, Hungary and 2 more countries, January 2025and 1 more |
| March 2025 | 8829.1 µg/m³ | 314thof 2,862 | Europe, March 2025 Europe, 14 February to 1 March 2025 |
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.
Bielsko-Biala's worst days
| Day | US AQI | Episode |
|---|---|---|
| 28 Dec 2024 | 203128.0 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 10 Jan 2024 | 198123.0 µg/m³ | Europe, 8 to 27 January 2024 |
| 27 Dec 2024 | 196120.0 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 23 Jan 2026 | 196120.0 µg/m³ | Europe, January and February 2026 |
| 22 Jan 2025 | 191112.0 µg/m³ | Germany, France and 19 more countries, January 2025 |
| 22 Jan 2026 | 191112.0 µg/m³ | Europe, January and February 2026 |
| 9 Jan 2024 | 187107.0 µg/m³ | Europe, 8 to 27 January 2024 |
| 25 Jan 2026 | 184102.0 µg/m³ | Europe, January and February 2026 |
| 24 Jan 2026 | 183101.0 µg/m³ | Europe, January and February 2026 |
| 29 Dec 2024 | 18198.0 µg/m³ | Europe, 24 December 2024 to 3 January 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, Bielsko-Biala, Poland, 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/pl/bielsko-biala/history (accessed 12 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.
Bielsko-Biala now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 23:07 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).