SmogRank / Poland / Świętokrzyskie / Kielce
Kielce, month by month
Kielce has a measured daily mean on 960 days since 12 January 2023. Its worst month was February 2025, at 107 US AQI (38.0 µg/m³), 120th of 2,633 cities on that month's world ranking. Its cleanest was August 2026, at 42 US AQI (7.5 µg/m³). 2025 averaged 65 US AQI (16.4 µg/m³), against 68 US AQI (18.0 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
17 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. |
| Feb 2026 | 18 of 28 days measured; a month needs 20. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Jun 2024 | 10 of 30 days measured; a month needs 21. The others: 20 with under 18 hours of readings or readings that failed our checks. |
| May 2024 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Apr 2024 | No day measured. 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 | 3 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Aug 2023 | 14 of 31 days measured; a month needs 22. The others: 17 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 | 18 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| May 2023 | 12 of 31 days measured; a month needs 22. The others: 19 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 | 6 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.
Kielce's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2025 | 10738.0 µg/m³ | 120thof 2,633 | Europe, 14 February to 1 March 2025 Europe, 1 to 14 February 2025 |
| January 2025 | 8628.1 µg/m³ | 116thof 2,474 | Germany, France and 19 more countries, January 2025 Europe, 24 December 2024 to 3 January 2025 |
| January 2026 | 8527.5 µg/m³ | 203rdof 2,617 | Europe, January and February 2026 Poland, January 2026 |
| December 2024 | 8527.1 µg/m³ | 127thof 2,616 | Europe, 24 December 2024 to 3 January 2025 Eastern Europe, 30 November to 8 December 2024 |
| March 2026 | 8225.5 µg/m³ | 415thof 2,971 | Europe, 18 to 25 March 2026 Poland, Slovenia and Slovakia, March 2026 |
| November 2024 | 7823.6 µg/m³ | 137thof 2,624 | Eastern Europe, 30 November to 8 December 2024 Europe, November 2024and 1 more |
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.
Kielce's worst days
| Day | US AQI | Episode |
|---|---|---|
| 19 Jan 2025 | 18198.2 µg/m³ | Germany, France and 19 more countries, January 2025 |
| 20 Jan 2025 | 17691.5 µg/m³ | Germany, France and 19 more countries, January 2025 |
| 6 Nov 2024 | 17488.5 µg/m³ | Europe, November 2024 |
| 21 Jan 2025 | 16473.6 µg/m³ | Germany, France and 19 more countries, January 2025 |
| 26 Dec 2024 | 16169.1 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 26 Feb 2025 | 16068.7 µg/m³ | Europe, 14 February to 1 March 2025 |
| 17 Feb 2025 | 15967.4 µg/m³ | Europe, 14 February to 1 March 2025 |
| 22 Jan 2025 | 15865.1 µg/m³ | Germany, France and 19 more countries, January 2025 |
| 27 Feb 2025 | 15864.9 µg/m³ | Europe, 14 February to 1 March 2025 |
| 5 Nov 2024 | 15764.2 µg/m³ | Europe, November 2024 |
Daily means, the highest since 12 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, Kielce, Poland, 12 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/kielce/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.
Kielce now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 19:07 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).