SmogRank / Poland / Łódź Voivodeship / Zgierz
Zgierz, month by month
Zgierz has a measured daily mean on 718 days since 1 January 2023. Its worst month was January 2026, at 116 US AQI (41.5 µg/m³), 76th of 2,617 cities on that month's world ranking. Its cleanest was June 2024, at 46 US AQI (8.2 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
23 months
| Month | Why |
|---|---|
| Oct 2026 | 5 of 11 days measured; a month needs 8. The others: 2 with no readings from the monitor, 4 with readings for part of the day (a day needs 18 hours). |
| May 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Apr 2026 | 13 of 30 days measured; a month needs 21. The others: 17 with under 18 hours of readings or readings that failed our checks. |
| Oct 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Sep 2025 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jul 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jun 2025 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| May 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Apr 2025 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Mar 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Feb 2025 | 6 of 28 days measured; a month needs 20. The others: 22 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 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2023 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | No day measured. The others: 1 missing from OpenAQ's archive, 30 with under 18 hours of readings or readings that failed our checks. |
| Jun 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. |
| May 2023 | 11 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks. |
| Apr 2023 | 20 of 30 days measured; a month needs 21. The others: 2 missing from OpenAQ's archive, 8 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 3 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Zgierz's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| January 2026 | 11641.5 µg/m³ | 76thof 2,617 | Europe, January and February 2026 Poland, January 2026 |
| January 2024 | 10135.7 µg/m³ | 85thof 2,385 | Europe, 8 to 27 January 2024 |
| December 2024 | 9935.0 µg/m³ | 61stof 2,616 | Europe, 24 December 2024 to 3 January 2025 |
| November 2024 | 9733.7 µg/m³ | 58thof 2,624 | Europe, November 2024 |
| January 2025 | 9432.2 µg/m³ | 78thof 2,474 | Germany, France and 19 more countries, January 2025 Europe, 24 December 2024 to 3 January 2025 |
| February 2026 | 9432.2 µg/m³ | 223rdof 2,866 | Germany, Poland and Czechia, February 2026 Europe, January and February 2026 |
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.
Zgierz's worst days
| Day | US AQI | Episode |
|---|---|---|
| 6 Jan 2026 | 196119.0 µg/m³ | Poland, January 2026 |
| 9 Jan 2024 | 186105.0 µg/m³ | Europe, 8 to 27 January 2024 |
| 10 Jan 2024 | 17994.8 µg/m³ | Europe, 8 to 27 January 2024 |
| 18 Feb 2026 | 17081.9 µg/m³ | Germany, Poland and Czechia, February 2026 |
| 22 Jan 2025 | 16576.0 µg/m³ | Germany, France and 19 more countries, January 2025 |
| 29 Dec 2024 | 16373.1 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 6 Nov 2024 | 16270.9 µg/m³ | Europe, November 2024 |
| 28 Dec 2024 | 16169.1 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 27 Dec 2024 | 15967.2 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 11 Jan 2024 | 15966.2 µg/m³ | Europe, 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, Zgierz, 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/zgierz/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.
Zgierz 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).