SmogRank / France / Auvergne-Rhône-Alpes / Grenoble
Grenoble, month by month
Grenoble has a measured daily mean on 1,080 days since 1 January 2023. Its worst month was February 2025, at 71 US AQI (20.0 µg/m³), 572nd of 2,633 cities on that month's world ranking. Its cleanest was September 2025, at 26 US AQI (4.7 µg/m³). 2025 averaged 53 US AQI (10.0 µg/m³), against 54 US AQI (10.5 µg/m³) in 2023.
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
12 months
| Month | Why |
|---|---|
| Jun 2026 | 18 of 30 days measured; a month needs 21. 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. |
| Oct 2025 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Jun 2025 | 17 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| May 2025 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Oct 2024 | 13 of 31 days measured; a month needs 22. The others: 18 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 | 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 2024 | 2 of 30 days measured; a month needs 21. The others: 28 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 | 2 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Mar 2024 | 10 of 31 days measured; a month needs 22. The others: 21 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.
Grenoble's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2025 | 7120.0 µg/m³ | 572ndof 2,633 | Europe, 14 February to 1 March 2025 Europe, 1 to 14 February 2025 |
| February 2023 | 7119.7 µg/m³ | 137thof 1,129 | Europe, 28 February to 4 March 2023 Europe, 6 to 25 February 2023 |
| December 2025 | 7119.6 µg/m³ | 524thof 3,006 | Europe, December 2025 to January 2026 France and Germany, December 2025 |
| January 2024 | 6818.2 µg/m³ | 325thof 2,385 | Europe, 27 January to 2 February 2024 Western Europe, January 2024and 1 more |
| January 2023 | 6516.4 µg/m³ | 219thof 1,261 | Auvergne-Rhône-Alpes and Provence-Alpes-Côte d'Azur, France, January 2023 France and Monaco, January 2023 |
| December 2023 | 6215.1 µg/m³ | 281stof 2,247 | Spain, France and 2 more countries, December 2023 to January 2024 |
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.
Grenoble's worst days
| Day | US AQI | Episode |
|---|---|---|
| 11 Jun 2025 | 13147.7 µg/m³ | Europe, June 2025 |
| 4 Mar 2023 | 13047.1 µg/m³ | Europe, 4 to 7 March 2023 Europe, 28 February to 4 March 2023 |
| 5 Mar 2023 | 11641.5 µg/m³ | Europe, 4 to 7 March 2023 |
| 3 Mar 2023 | 11641.4 µg/m³ | Europe, 28 February to 4 March 2023 |
| 19 Jan 2025 | 11440.9 µg/m³ | Germany, France and 19 more countries, January 2025 |
| 28 Dec 2023 | 11240.0 µg/m³ | Spain, France and 2 more countries, December 2023 to January 2024 |
| 29 Dec 2023 | 11039.1 µg/m³ | Spain, France and 2 more countries, December 2023 to January 2024 |
| 20 Jan 2025 | 10938.7 µg/m³ | Germany, France and 19 more countries, January 2025 |
| 2 Jan 2026 | 10737.9 µg/m³ | Europe, December 2025 to January 2026 |
| 19 Feb 2025 | 10436.8 µg/m³ | Europe, 14 February to 1 March 2025 |
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, Grenoble, France, 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/fr/grenoble/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.
Grenoble 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).