SmogRank / Episodes / Italy

Italy and France, November 2023

For 2 days, from 19 to 20 November 2023, 8 cities in Italy and France had PM2.5 at least twice their usual for the time of year. The worst reading was Montemurlo, Tuscany, Italy: 55.0 µg/m³ on 19 November, about 3.1× its usual 18.0.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached8in 2 countries
Days219 to 20 November 2023
Worst day19 November8 cities counted
Furthest above usual4.5×Prato

Day by day

19 November 8 cities at twice their usual or more
AlessandriaTurinLuganoMonacoLa SpeziaNiceBellinzonaCannesViareggioFréjusPisaLivornoBastiaAlbertvilleGapBernAnnecyAnnemasseChambéryMeylanGrenobleManosqueRoveretoPoggibonsiTrentoToulonAix-en-ProvenceGardanneGrossetoBolzanoMarseilleVitrollesLons-le-SaunierSalon-de-ProvenceValenceBourg-en-BresseMeyzieuAvignonFos-sur-MerLyonGivorsArlesMâconSaint-ChamondSaint-ÉtienneChalon-sur-SaôneNîmesLunelPesaroMontceau-les-MinesMontpellierJesiFalconara MarittimaAnconaCivitanova MarcheClermont-FerrandPerpignanSallanchesCapannoriRomans-sur-IsèreFlorenceMassaMontemurloArezzoPrato
16 Nov17181920212223
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

MontemurloMontemurlo, 16 November: 13.0 µg/m³, 0.7× usualMontemurlo, 17 November: 15.0 µg/m³, 0.8× usualMontemurlo, 18 November: 24.0 µg/m³, 1.3× usualMontemurlo, 19 November: 55.0 µg/m³, 3.1× usualMontemurlo, 20 November: 54.0 µg/m³, 3.0× usualMontemurlo, 21 November: 16.0 µg/m³, 0.9× usualMontemurlo, 22 November: 5.0 µg/m³, 0.3× usualMontemurlo, 23 November: 11.0 µg/m³, 0.6× usualPratoPrato, 16 November: 9.0 µg/m³, 0.9× usualPrato, 17 November: 10.0 µg/m³, 1.0× usualPrato, 18 November: 17.0 µg/m³, 1.7× usualPrato, 19 November: 45.0 µg/m³, 4.5× usualPrato, 20 November: 42.0 µg/m³, 4.2× usualPrato, 21 November: 14.0 µg/m³, 1.4× usualPrato, 22 November: 3.5 µg/m³, 0.4× usualPrato, 23 November: 6.0 µg/m³, 0.6× usualCapannoriCapannori, 16 November: 11.3 µg/m³, 0.8× usualCapannori, 17 November: 16.3 µg/m³, 1.2× usualCapannori, 18 November: 28.0 µg/m³, 2.0× usualCapannori, 19 November: 37.2 µg/m³, 2.6× usualCapannori, 20 November: 37.0 µg/m³, 2.6× usualCapannori, 21 November: 18.0 µg/m³, 1.3× usualCapannori, 22 November: 3.5 µg/m³, 0.2× usualCapannori, 23 November: 30.7 µg/m³, 2.2× usualArezzoArezzo, 16 November: 12.0 µg/m³, 1.2× usualArezzo, 17 November: 13.0 µg/m³, 1.3× usualArezzo, 18 November: 19.0 µg/m³, 1.9× usualArezzo, 19 November: 37.0 µg/m³, 3.7× usualArezzo, 20 November: 28.0 µg/m³, 2.8× usualArezzo, 21 November: 12.0 µg/m³, 1.2× usualArezzo, 22 November: 4.0 µg/m³, 0.4× usualArezzo, 23 November: 12.0 µg/m³, 1.2× usualFlorenceFlorence, 16 November: 11.0 µg/m³, 1.0× usualFlorence, 17 November: 10.5 µg/m³, 0.9× usualFlorence, 18 November: 14.0 µg/m³, 1.2× usualFlorence, 19 November: 32.0 µg/m³, 2.8× usualFlorence, 20 November: 35.0 µg/m³, 3.1× usualFlorence, 21 November: 15.0 µg/m³, 1.3× usualFlorence, 22 November: 4.5 µg/m³, 0.4× usualFlorence, 23 November: 7.0 µg/m³, 0.6× usualRomans-sur-IsèreRomans-sur-Isère, 16 November: 9.5 µg/m³, 0.8× usualRomans-sur-Isère, 17 November: 5.8 µg/m³, 0.5× usualRomans-sur-Isère, 18 November: 15.9 µg/m³, 1.4× usualRomans-sur-Isère, 19 November: 28.6 µg/m³, 2.6× usualRomans-sur-Isère, 20 November: 19.4 µg/m³, 1.7× usualRomans-sur-Isère, 21 November: 5.8 µg/m³, 0.5× usualRomans-sur-Isère, 22 November: 6.0 µg/m³, 0.5× usualRomans-sur-Isère, 23 November: 10.9 µg/m³, 1.0× usualSallanchesSallanches, 16 November: 9.2 µg/m³, 0.7× usualSallanches, 17 November: 8.6 µg/m³, 0.6× usualSallanches, 18 November: 23.7 µg/m³, 1.8× usualSallanches, 19 November: 27.7 µg/m³, 2.1× usualSallanches, 20 November: 21.9 µg/m³, 1.6× usualSallanches, 21 November: 18.2 µg/m³, 1.4× usualSallanches, 22 November: 18.7 µg/m³, 1.4× usualSallanches, 23 November: 20.9 µg/m³, 1.6× usualMassaMassa, 16 November: 9.0 µg/m³, 1.1× usualMassa, 17 November: 9.0 µg/m³, 1.1× usualMassa, 18 November: 9.0 µg/m³, 1.1× usualMassa, 19 November: 25.0 µg/m³, 3.1× usualMassa, 20 November: 10.0 µg/m³, 1.3× usualMassa, 21 November: 9.0 µg/m³, 1.1× usualMassa, 22 November: 3.0 µg/m³, 0.4× usualMassa, 23 November: 12.0 µg/m³, 1.5× usual16 Nov17181920212223
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
PratoTuscany, Italy2 45.019 November10.04.5×
ArezzoTuscany, Italy2 37.019 November10.03.7×
MassaTuscany, Italy1 25.019 November8.03.1×
FlorenceTuscany, Italy2 35.020 November11.33.1×
MontemurloTuscany, Italy2 55.019 November18.03.1×
CapannoriTuscany, Italy2 37.219 November14.12.6×
Romans-sur-IsèreAuvergne-Rhône-Alpes, France1 28.619 November11.22.6×
SallanchesAuvergne-Rhône-Alpes, France1 27.719 November13.42.1×

Daily means in µg/m³. Usual: the city's median for this time of year (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that.

Against other episodes in Italy and France

Number 12 of 13 episodes in Italy and France since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 13.

Use this page

SmogRank, Italy and France, November 2023: 8 cities with PM2.5 at twice their usual or more, 19 to 20 November 2023, smogrank.com/episodes/2023-11-italy-and-france (accessed 2 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.