SmogRank / Germany / Rheinland-Pfalz / Höhr-Grenzhausen
Höhr-Grenzhausen, month by month
Höhr-Grenzhausen has a measured daily mean on 921 days since 14 February 2023. Its worst month was February 2025, at 58 US AQI (13.1 µg/m³), 952nd of 2,633 cities on that month's world ranking. Its cleanest was November 2023, at 15 US AQI (2.7 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
19 months
| Month | Why |
|---|---|
| Jun 2026 | 17 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| Feb 2026 | 19 of 28 days measured; a month needs 20. The others: 9 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. |
| Jun 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. |
| Jan 2025 | 18 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| Dec 2024 | 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 2024 | 20 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Oct 2024 | 15 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks. |
| Sep 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2024 | 14 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks. |
| Mar 2024 | 15 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks. |
| Feb 2024 | 16 of 29 days measured; a month needs 21. The others: 1 missing from OpenAQ's archive, 12 with under 18 hours of readings or readings that failed our checks. |
| Dec 2023 | 21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Oct 2023 | 8 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks. |
| Sep 2023 | 1 of 30 days measured; a month needs 21. The others: 29 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 | 12 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 18 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 | 2 of 28 days measured; a month needs 20. The others: 13 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Höhr-Grenzhausen's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2025 | 5813.1 µg/m³ | 952ndof 2,633 | Europe, 14 February to 1 March 2025 Europe, 1 to 14 February 2025 |
| January 2026 | 5511.2 µg/m³ | 977thof 2,617 | Europe, January and February 2026 |
| June 2023 | 529.7 µg/m³ | 841stof 1,603 | – |
| March 2025 | 529.5 µg/m³ | 1,686thof 2,862 | Europe, 14 February to 1 March 2025 |
| May 2023 | 509.0 µg/m³ | 664thof 1,600 | Europe, May 2023 |
| March 2026 | 478.4 µg/m³ | 2,035thof 2,971 | – |
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.
Höhr-Grenzhausen's worst days
| Day | US AQI | Episode |
|---|---|---|
| 10 Feb 2025 | 12143.7 µg/m³ | Europe, 1 to 14 February 2025 |
| 24 Jan 2026 | 10436.7 µg/m³ | Europe, January and February 2026 |
| 9 Feb 2025 | 9834.4 µg/m³ | Europe, 1 to 14 February 2025 |
| 25 Jan 2026 | 9633.3 µg/m³ | Europe, January and February 2026 |
| 23 Jan 2026 | 9633.2 µg/m³ | Europe, January and February 2026 |
| 22 May 2023 | 9030.0 µg/m³ | Europe, May 2023 |
| 22 Jan 2026 | 8728.6 µg/m³ | Europe, January and February 2026 |
| 20 Feb 2025 | 8125.3 µg/m³ | Europe, 14 February to 1 March 2025 |
| 10 Jan 2024 | 8024.6 µg/m³ | – |
| 8 Feb 2025 | 8024.6 µg/m³ | Europe, 1 to 14 February 2025 |
Daily means, the highest since 14 Feb 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, Höhr-Grenzhausen, Germany, 14 Feb 2023 – 10 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/de/hoehr-grenzhausen/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.
Höhr-Grenzhausen now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 04:07 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).