SmogRank / France / Auvergne-Rhône-Alpes / Lyon
Lyon, month by month
Lyon has a measured daily mean on 1,065 days since 1 January 2023. Its worst month was February 2023, at 74 US AQI (21.5 µg/m³), 99th of 1,129 cities on that month's world ranking. Its cleanest was September 2025, at 28 US AQI (5.0 µg/m³). 2025 averaged 52 US AQI (9.7 µg/m³), against 53 US AQI (10.0 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
13 months
| Month | Why |
|---|---|
| Jun 2026 | 15 of 30 days measured; a month needs 21. The others: 15 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. |
| Aug 2025 | 19 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Jun 2025 | 12 of 30 days measured; a month needs 21. The others: 18 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.
Lyon's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2023 | 7421.5 µg/m³ | 99thof 1,129 | Europe, 28 February to 4 March 2023 Europe, 6 to 25 February 2023and 1 more |
| January 2024 | 7119.6 µg/m³ | 285thof 2,385 | Europe, 27 January to 2 February 2024 Europe, 8 to 27 January 2024and 3 more |
| February 2025 | 7019.4 µg/m³ | 609thof 2,633 | Europe, 14 February to 1 March 2025 |
| December 2024 | 6717.7 µg/m³ | 352ndof 2,616 | Europe, 24 December 2024 to 3 January 2025 Europe, 12 to 14 December 2024 |
| December 2025 | 6617.0 µg/m³ | 644thof 3,006 | Europe, December 2025 to January 2026 France and Germany, December 2025 |
| November 2024 | 6214.8 µg/m³ | 423rdof 2,624 | Auvergne-Rhône-Alpes and Provence-Alpes-Côte d'Azur, France, November 2024 Europe, November 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.
Lyon's worst days
| Day | US AQI | Episode |
|---|---|---|
| 21 Jan 2025 | 15560.7 µg/m³ | Germany, France and 19 more countries, January 2025 |
| 13 Feb 2023 | 15358.0 µg/m³ | Europe, 6 to 25 February 2023 |
| 12 Feb 2023 | 15256.9 µg/m³ | Europe, 6 to 25 February 2023 |
| 20 Jan 2025 | 14854.6 µg/m³ | Germany, France and 19 more countries, January 2025 |
| 18 Feb 2025 | 14352.6 µg/m³ | Europe, 14 February to 1 March 2025 |
| 13 Jan 2024 | 13549.3 µg/m³ | Europe, 8 to 27 January 2024 |
| 11 Feb 2023 | 13247.9 µg/m³ | Europe, 6 to 25 February 2023 |
| 27 Dec 2024 | 12746.1 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 19 Jan 2025 | 12746.0 µg/m³ | Germany, France and 19 more countries, January 2025 |
| 12 Jan 2024 | 12244.1 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, Lyon, 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/lyon/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.
Lyon 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).