SmogRank / Poland / Mazovia / Żyrardów
Żyrardów, month by month
Żyrardów has a measured daily mean on 1,041 days since 1 January 2023. Its worst month was February 2025, at 105 US AQI (37.1 µg/m³), 130th of 2,633 cities on that month's world ranking. Its cleanest was July 2026, at 26 US AQI (4.7 µg/m³). 2025 averaged 64 US AQI (16.0 µg/m³), against 63 US AQI (15.3 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
16 months
| Month | Why |
|---|---|
| Oct 2026 | No day measured. The others: 8 with no readings from the monitor, 4 with readings for part of the day (a day needs 18 hours). |
| Jun 2026 | 8 of 30 days measured; a month needs 21. The others: 22 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 | 10 of 30 days measured; a month needs 21. The others: 20 with under 18 hours of readings or readings that failed our checks. |
| Feb 2026 | 16 of 28 days measured; a month needs 20. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Jan 2026 | 21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Nov 2025 | 15 of 30 days measured; a month needs 21. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| Sep 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. |
| 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 | 4 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks. |
| Sep 2023 | 16 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| Aug 2023 | 18 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | 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 2023 | 15 of 30 days measured; a month needs 21. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| May 2023 | 19 of 31 days measured; a month needs 22. The others: 12 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.
Żyrardów's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2025 | 10537.1 µg/m³ | 130thof 2,633 | Europe, 14 February to 1 March 2025 Europe, 1 to 14 February 2025 |
| March 2025 | 8627.8 µg/m³ | 350thof 2,862 | Europe, March 2025 Germany, Poland and 25 more countries, March 2025and 1 more |
| March 2024 | 8225.5 µg/m³ | 67thof 1,698 | Europe, March and April 2024 Poland, 20 to 21 March 2024and 1 more |
| December 2024 | 7521.8 µg/m³ | 201stof 2,616 | Europe, 24 December 2024 to 3 January 2025 Eastern Europe, 30 November to 8 December 2024 |
| December 2025 | 7421.6 µg/m³ | 455thof 3,006 | Europe, December 2025 to January 2026 |
| January 2023 | 7321.1 µg/m³ | 137thof 1,261 | – |
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.
Żyrardów's worst days
| Day | US AQI | Episode |
|---|---|---|
| 6 Jan 2026 | 18097.1 µg/m³ | Poland, January 2026 |
| 22 Jan 2025 | 16677.4 µg/m³ | Germany, France and 19 more countries, January 2025 |
| 9 Jan 2024 | 16270.5 µg/m³ | Europe, 8 to 27 January 2024 |
| 22 Jan 2026 | 16170.2 µg/m³ | Europe, January and February 2026 |
| 24 Feb 2025 | 16068.2 µg/m³ | Europe, 14 February to 1 March 2025 |
| 8 Mar 2025 | 15865.6 µg/m³ | Germany, Poland and 25 more countries, March 2025 |
| 21 Jan 2026 | 15662.3 µg/m³ | Europe, January and February 2026 |
| 2 Mar 2023 | 15560.8 µg/m³ | Europe, 28 February to 4 March 2023 |
| 17 Feb 2025 | 15560.6 µg/m³ | Europe, 14 February to 1 March 2025 |
| 27 Jan 2026 | 15359.0 µg/m³ | Europe, 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, Żyrardów, Poland, 1 Jan 2023 – 25 Sep 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/pl/zyrardow/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.
Żyrardów 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).