SmogRank / Episodes / France

Auvergne-Rhône-Alpes and Bourgogne-Franche-Comté, France, February 2024

For 1 day, on 1 February 2024, 10 cities in France had PM2.5 at least twice their usual for the time of year. The worst reading was Lyon, Auvergne-Rhône-Alpes, France: 38.3 µg/m³ on 1 February, about 3.2× its usual 12.1.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached10in 1 country
Days11 February 2024
Worst day1 February10 cities counted
Furthest above usual3.2×Lyon

Day by day

1 February 10 cities at twice their usual or more
Lons-le-SaunierMâconChalon-sur-SaôneBesançonDijonAlbertvilleMeylanMontceau-les-MinesGrenobleSallanchesSaint-ChamondRomans-sur-IsèreSaint-ÉtienneVesoulValenceMontbéliardGapAostaVichyBernÉpinalMoulinsMulhouseSaint-DizierAuxerreNeversTroyesBaselClermont-FerrandNancyAvignonLunévilleLörrachTurinMüllheimMontluçonBraFreiburgBorgomaneroVercelliBourgesStrasbourgMontargisKehlZürichNovaraAurillacVareseAlessandriaFontainebleauVillingen-SchwenningenLuganoRodezVigevanoBellinzonaMelunSavonaSaronnoComoBaden-BadenErbaMilanChâteaurouxPaviaMonzaOlivetOrléansSainte-Geneviève-des-BoisKreuzlingenÉtampesKonstanzLeccoVimercateGenoaHerrenbergLodiDalmineTreviglioTübingenFriedrichshafenBergamoLimogesReutlingenRambouilletBloisLindauSondrioFilderstadtStuttgartChartresBiberach an der RißCremonaMontaubanDreuxBresciaLa SpeziaUlmNeu-UlmAnnemasseAnnecyChambéryVillefranche-sur-SaôneBourg-en-BresseDoleGivorsMeyzieuVillefontaineLyon
29 Jan30311 Feb234
Every measured city in the area, coloured by its PM2.5 that day; a dark ring marks a city at twice its usual or more. Bars: cities counted each day, coloured by their median level. Choose a day or press play; without JavaScript, the days link to that day's world ranking.

How it spread

LyonLyon, 29 January: 8.2 µg/m³Lyon, 30 January: 15.6 µg/m³Lyon, 31 January: 33.3 µg/m³Lyon, 1 February: 38.3 µg/m³, 3.2× its usual 12.1Lyon, 2 February: 6.8 µg/m³Lyon, 3 February: 16.6 µg/m³Lyon, 4 February: 8.9 µg/m³GivorsGivors, 29 January: 7.7 µg/m³Givors, 30 January: 14.7 µg/m³Givors, 31 January: 30.1 µg/m³Givors, 1 February: 36.1 µg/m³, 2.8× its usual 13.0Givors, 2 February: 8.1 µg/m³Givors, 3 February: 19.8 µg/m³Givors, 4 February: 14.4 µg/m³MeyzieuMeyzieu, 29 January: 7.4 µg/m³Meyzieu, 30 January: 10.1 µg/m³Meyzieu, 31 January: 24.4 µg/m³Meyzieu, 1 February: 35.9 µg/m³, 2.9× its usual 12.3Meyzieu, 2 February: 9.6 µg/m³Meyzieu, 3 February: 14.4 µg/m³Meyzieu, 4 February: 6.1 µg/m³AnnecyAnnecy, 29 January: 25.0 µg/m³Annecy, 30 January: 30.6 µg/m³Annecy, 31 January: 28.8 µg/m³Annecy, 1 February: 32.4 µg/m³, 2.2× its usual 14.6Annecy, 2 February: 21.7 µg/m³Annecy, 3 February: 23.1 µg/m³Annecy, 4 February: 15.8 µg/m³VillefontaineVillefontaine, 29 January: no readingVillefontaine, 30 January: no readingVillefontaine, 31 January: no readingVillefontaine, 1 February: 29.0 µg/m³, 3.0× its usual 9.6Villefontaine, 2 February: no readingVillefontaine, 3 February: no readingVillefontaine, 4 February: no readingChambéryChambéry, 29 January: 20.8 µg/m³Chambéry, 30 January: 21.1 µg/m³Chambéry, 31 January: 22.0 µg/m³Chambéry, 1 February: 28.1 µg/m³, 2.4× its usual 11.7Chambéry, 2 February: 17.3 µg/m³Chambéry, 3 February: 18.5 µg/m³Chambéry, 4 February: 18.6 µg/m³Villefranche-sur-Sa…Villefranche-sur-Saône, 29 January: 12.5 µg/m³Villefranche-sur-Saône, 30 January: 21.3 µg/m³Villefranche-sur-Saône, 31 January: 27.9 µg/m³Villefranche-sur-Saône, 1 February: 27.9 µg/m³, 2.5× its usual 11.2Villefranche-sur-Saône, 2 February: 10.4 µg/m³Villefranche-sur-Saône, 3 February: 14.7 µg/m³Villefranche-sur-Saône, 4 February: 6.9 µg/m³AnnemasseAnnemasse, 29 January: 25.4 µg/m³Annemasse, 30 January: 26.0 µg/m³Annemasse, 31 January: 24.8 µg/m³Annemasse, 1 February: 26.3 µg/m³, 2.1× its usual 12.6Annemasse, 2 February: 25.2 µg/m³Annemasse, 3 February: 24.5 µg/m³Annemasse, 4 February: 19.9 µg/m³Bourg-en-BresseBourg-en-Bresse, 29 January: 8.4 µg/m³Bourg-en-Bresse, 30 January: 12.1 µg/m³Bourg-en-Bresse, 31 January: 20.4 µg/m³Bourg-en-Bresse, 1 February: 26.0 µg/m³, 2.6× its usual 9.9Bourg-en-Bresse, 2 February: 13.3 µg/m³Bourg-en-Bresse, 3 February: 14.1 µg/m³Bourg-en-Bresse, 4 February: 6.6 µg/m³DoleDole, 29 January: 16.8 µg/m³Dole, 30 January: 29.6 µg/m³Dole, 31 January: 29.3 µg/m³Dole, 1 February: 25.1 µg/m³, 2.7× its usual 9.2Dole, 2 February: 16.1 µg/m³Dole, 3 February: 14.4 µg/m³Dole, 4 February: 5.9 µg/m³29 Jan30311 Feb234
Every counted city, in the order the episode reached them, 3 days before to 3 after. Each square is a day, coloured by that day's PM2.5; outlined: at twice the city's usual or more.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

Every city it reached

CityDaysHighestUsualAbove usual
LyonAuvergne-Rhône-Alpes, France1 38.31 February12.13.2×
VillefontaineAuvergne-Rhône-Alpes, France1 29.01 February9.63.0×
MeyzieuAuvergne-Rhône-Alpes, France1 35.91 February12.32.9×
GivorsAuvergne-Rhône-Alpes, France1 36.11 February13.02.8×
DoleBourgogne-Franche-Comté, France1 25.11 February9.22.7×
Bourg-en-BresseAuvergne-Rhône-Alpes, France1 26.01 February9.92.6×
Villefranche-sur-SaôneAuvergne-Rhône-Alpes, France1 27.91 February11.22.5×
ChambéryAuvergne-Rhône-Alpes, France1 28.11 February11.72.4×
AnnecyAuvergne-Rhône-Alpes, France1 32.41 February14.62.2×
AnnemasseAuvergne-Rhône-Alpes, France1 26.31 February12.62.1×

Daily means in µg/m³, over the days each city counted in this episode. Highest: its highest of those days. Usual: the city's median for the time of year of that day (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that, with a usual under 5 µg/m³ taken as 5.

Against other episodes in France

Number 21 of 27 episodes in France since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 27.

Use this page

SmogRank, Auvergne-Rhône-Alpes and Bourgogne-Franche-Comté, France, February 2024: 10 cities with PM2.5 at twice their usual or more, 1 February 2024, smogrank.com/episodes/2024-02-auvergne-rhone-alpes-and-bourgogne-franche-comte-france (accessed 4 October 2026).

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.

An episode is a run of days when many cities close to each other (four or more within 350 km on a day, 8 or more in all) each had a daily PM2.5 mean of at least 25 µg/m³ and at least 2 times their usual for that time of year. Found in our own measurements, not picked by hand. How we find episodes. Values are each city's daily mean of its own monitors; causes are the usual kinds for a pattern like this, not a confirmed source.