SmogRank / Episodes / Chile

South-western Chile, August and September 2024

For 3 days, from 30 August to 1 September 2024, 10 cities in Chile had PM2.5 at least twice their usual for the time of year. The worst reading was Nacimiento, Biobio, Chile: 109.9 µg/m³ on 31 August, about 2.5× its usual 44.5.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached10in 1 country
Days330 August to 1 September 2024
Worst day31 August8 cities counted
Furthest above usual3.7×Los Ángeles

Day by day

31 August 8 cities at twice their usual or more
HualquiLotaChiguayanteConcepciónSan Pedro de la PazHualpénToméCauquenesTalcaChillánCoronelCuranilahueNacimientoVillarricaTemucoTalcahuanoValdiviaLos Ángeles
27 Aug282930311 Sep234
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

CoronelCoronel, 27 August: 42.5 µg/m³, 1.4× usualCoronel, 28 August: 57.5 µg/m³, 1.9× usualCoronel, 29 August: 62.3 µg/m³, 2.1× usualCoronel, 30 August: 66.9 µg/m³, 2.3× usualCoronel, 31 August: 56.0 µg/m³, 1.9× usualCoronel, 1 September: 42.0 µg/m³, 1.4× usualCoronel, 2 September: 26.1 µg/m³, 0.9× usualCoronel, 3 September: 32.7 µg/m³, 1.1× usualCoronel, 4 September: 37.6 µg/m³, 1.3× usualTalcahuanoTalcahuano, 27 August: 25.2 µg/m³, 1.1× usualTalcahuano, 28 August: 36.7 µg/m³, 1.5× usualTalcahuano, 29 August: 57.9 µg/m³, 2.4× usualTalcahuano, 30 August: 51.8 µg/m³, 2.2× usualTalcahuano, 31 August: 63.2 µg/m³, 2.6× usualTalcahuano, 1 September: 28.6 µg/m³, 1.2× usualTalcahuano, 2 September: 17.2 µg/m³, 0.7× usualTalcahuano, 3 September: 38.7 µg/m³, 1.6× usualTalcahuano, 4 September: 34.7 µg/m³, 1.4× usualCuranilahueCuranilahue, 27 August: 38.6 µg/m³, 1.1× usualCuranilahue, 28 August: 38.3 µg/m³, 1.1× usualCuranilahue, 29 August: 66.4 µg/m³, 1.9× usualCuranilahue, 30 August: 73.2 µg/m³, 2.1× usualCuranilahue, 31 August: 77.7 µg/m³, 2.3× usualCuranilahue, 1 September: 44.1 µg/m³, 1.3× usualCuranilahue, 2 September: 28.0 µg/m³, 0.8× usualCuranilahue, 3 September: 40.0 µg/m³, 1.2× usualCuranilahue, 4 September: 37.9 µg/m³, 1.1× usualTemucoTemuco, 27 August: 48.8 µg/m³, 1.6× usualTemuco, 28 August: 53.8 µg/m³, 1.8× usualTemuco, 29 August: 57.3 µg/m³, 1.9× usualTemuco, 30 August: 65.6 µg/m³, 2.2× usualTemuco, 31 August: 74.7 µg/m³, 2.5× usualTemuco, 1 September: 42.7 µg/m³, 1.4× usualTemuco, 2 September: 23.8 µg/m³, 0.8× usualTemuco, 3 September: 29.0 µg/m³, 1.0× usualTemuco, 4 September: 39.6 µg/m³, 1.3× usualNacimientoNacimiento, 27 August: 45.6 µg/m³, 1.0× usualNacimiento, 28 August: 63.2 µg/m³, 1.4× usualNacimiento, 29 August: 46.4 µg/m³, 1.0× usualNacimiento, 30 August: 59.7 µg/m³, 1.3× usualNacimiento, 31 August: 109.9 µg/m³, 2.5× usualNacimiento, 1 September: 76.1 µg/m³, 1.7× usualNacimiento, 2 September: 29.5 µg/m³, 0.7× usualNacimiento, 3 September: 48.8 µg/m³, 1.1× usualNacimiento, 4 September: 44.3 µg/m³, 1.0× usualValdiviaValdivia, 27 August: 77.0 µg/m³, 2.1× usualValdivia, 28 August: 28.5 µg/m³, 0.8× usualValdivia, 29 August: no readingValdivia, 30 August: 54.0 µg/m³, 1.5× usualValdivia, 31 August: 97.9 µg/m³, 2.7× usualValdivia, 1 September: 37.3 µg/m³, 1.0× usualValdivia, 2 September: 20.0 µg/m³, 0.6× usualValdivia, 3 September: 25.5 µg/m³, 0.7× usualValdivia, 4 September: 51.2 µg/m³, 1.4× usualLos ÁngelesLos Ángeles, 27 August: 30.6 µg/m³, 1.2× usualLos Ángeles, 28 August: 23.0 µg/m³, 0.9× usualLos Ángeles, 29 August: 26.1 µg/m³, 1.0× usualLos Ángeles, 30 August: 43.8 µg/m³, 1.7× usualLos Ángeles, 31 August: 97.6 µg/m³, 3.7× usualLos Ángeles, 1 September: 52.6 µg/m³, 2.0× usualLos Ángeles, 2 September: 20.0 µg/m³, 0.8× usualLos Ángeles, 3 September: 25.5 µg/m³, 1.0× usualLos Ángeles, 4 September: 29.2 µg/m³, 1.1× usualVillarricaVillarrica, 27 August: 54.6 µg/m³, 1.5× usualVillarrica, 28 August: 28.5 µg/m³, 0.8× usualVillarrica, 29 August: 24.3 µg/m³, 0.7× usualVillarrica, 30 August: 37.3 µg/m³, 1.0× usualVillarrica, 31 August: 93.5 µg/m³, 2.5× usualVillarrica, 1 September: 83.2 µg/m³, 2.3× usualVillarrica, 2 September: 29.9 µg/m³, 0.8× usualVillarrica, 3 September: 35.2 µg/m³, 1.0× usualVillarrica, 4 September: 40.4 µg/m³, 1.1× usualChillánChillán, 27 August: 27.9 µg/m³, 1.0× usualChillán, 28 August: 34.5 µg/m³, 1.2× usualChillán, 29 August: 40.4 µg/m³, 1.4× usualChillán, 30 August: 37.1 µg/m³, 1.3× usualChillán, 31 August: 63.0 µg/m³, 2.2× usualChillán, 1 September: 64.9 µg/m³, 2.3× usualChillán, 2 September: 25.9 µg/m³, 0.9× usualChillán, 3 September: 35.0 µg/m³, 1.2× usualChillán, 4 September: 37.1 µg/m³, 1.3× usualTalcaTalca, 27 August: 23.3 µg/m³, 1.0× usualTalca, 28 August: 48.5 µg/m³, 2.0× usualTalca, 29 August: 40.4 µg/m³, 1.6× usualTalca, 30 August: 27.9 µg/m³, 1.1× usualTalca, 31 August: 39.7 µg/m³, 1.6× usualTalca, 1 September: 49.7 µg/m³, 2.0× usualTalca, 2 September: 24.9 µg/m³, 1.0× usualTalca, 3 September: 25.2 µg/m³, 1.0× usualTalca, 4 September: 22.8 µg/m³, 0.9× usual27 Aug282930311 Sep234
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
Los ÁngelesBiobio, Chile2 97.631 August26.23.7×
ValdiviaLos Ríos Region, Chile1 97.931 August36.22.7×
TalcahuanoBiobio, Chile2 63.231 August24.02.6×
VillarricaAraucania, Chile2 93.531 August36.82.5×
TemucoAraucania, Chile2 74.731 August29.62.5×
NacimientoBiobio, Chile1 109.931 August44.52.5×
CoronelBiobio, Chile1 66.930 August29.52.3×
CuranilahueBiobio, Chile2 77.731 August34.32.3×
ChillánÑuble, Chile2 64.91 September28.82.3×
TalcaMaule Region, Chile1 49.71 September24.52.0×

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 Chile

Number 20 of 30 episodes in Chile since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 30.

Use this page

SmogRank, South-western Chile, August and September 2024: 10 cities with PM2.5 at twice their usual or more, 30 August to 1 September 2024, smogrank.com/episodes/2024-08-south-western-chile-4 (accessed 3 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.