Olpe, month by month
Olpe has a measured daily mean on 376 days since 28 September 2025. Its worst month was January 2026, at 69 US AQI (19.0 µg/m³), 497th of 2,617 cities on that month's world ranking. Its cleanest was September 2026, at 14 US AQI (2.6 µg/m³).
Every month since 2025
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
1 month
| Month | Why |
|---|---|
| Sep 2025 | 3 of 30 days measured; a month needs 21. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Olpe's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| January 2026 | 6919.0 µg/m³ | 497thof 2,617 | Europe, January and February 2026 Germany and France, January 2026and 1 more |
| March 2026 | 6214.9 µg/m³ | 855thof 2,971 | Europe, 18 to 25 March 2026 Europe, 1 to 12 March 2026 |
| February 2026 | 5612.0 µg/m³ | 1,022ndof 2,866 | Europe, January and February 2026 |
| December 2025 | 5511.1 µg/m³ | 1,114thof 3,006 | Europe, December 2025 to January 2026 |
| November 2025 | 5410.8 µg/m³ | 905thof 2,715 | Europe, 8 to 10 November 2025 |
| October 2025 | 386.9 µg/m³ | 1,211thof 2,614 | Belgium, France and 2 more countries, October 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.
Olpe's worst days
| Day | US AQI | Episode |
|---|---|---|
| 25 Jan 2026 | 14754.1 µg/m³ | Europe, January and February 2026 |
| 24 Jan 2026 | 12143.5 µg/m³ | Europe, January and February 2026 |
| 20 Mar 2026 | 10838.4 µg/m³ | Europe, 18 to 25 March 2026 |
| 23 Jan 2026 | 10537.0 µg/m³ | Europe, January and February 2026 |
| 24 Mar 2026 | 9733.8 µg/m³ | Europe, 18 to 25 March 2026 |
| 9 Mar 2026 | 9633.3 µg/m³ | Europe, 1 to 12 March 2026 |
| 9 Nov 2025 | 9532.8 µg/m³ | Europe, 8 to 10 November 2025 |
| 8 Mar 2026 | 9532.7 µg/m³ | Europe, 1 to 12 March 2026 |
| 22 Jan 2026 | 9432.2 µg/m³ | Europe, January and February 2026 |
| 19 Jan 2026 | 9331.7 µg/m³ | Europe, January and February 2026 |
Daily means, the highest since 28 Sept 2025; 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, Olpe, Germany, 28 Sep 2025 – 11 Oct 2026. Monitor data from national networks via OpenAQ and the publishers listed at smogrank.com/sources. smogrank.com/de/olpe/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.
Olpe now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 18:07 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).