SmogRank / Episodes / Chile

South-western Chile, August 2023

For 2 days, from 26 to 27 August 2023, 11 cities in Chile had PM2.5 at least twice their usual for the time of year. The worst reading was Osorno, Los Lagos Region, Chile: 217.0 µg/m³ on 26 August, about 4.6× its usual 47.3.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached11in 1 country
Days226 to 27 August 2023
Worst day27 August9 cities counted
Furthest above usual4.6×Osorno

Day by day

27 August 9 cities at twice their usual or more
ValdiviaLotaCoronelHualquiChiguayanteSan Pedro de la PazConcepciónPuerto MonttToméCuranilahueTemucoLa UniónNacimientoTalcahuanoSan CarlosChillánLos ÁngelesPuerto VarasOsorno
23 Aug24252627282930
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

Puerto VarasPuerto Varas, 23 August: 56.9 µg/m³, 1.2× usualPuerto Varas, 24 August: 137.0 µg/m³, 2.8× usualPuerto Varas, 25 August: 167.0 µg/m³, 3.5× usualPuerto Varas, 26 August: 179.0 µg/m³, 3.7× usualPuerto Varas, 27 August: 146.0 µg/m³, 3.0× usualPuerto Varas, 28 August: 47.3 µg/m³, 1.0× usualPuerto Varas, 29 August: 122.0 µg/m³, 2.5× usualPuerto Varas, 30 August: 53.7 µg/m³, 1.1× usualOsornoOsorno, 23 August: 45.8 µg/m³, 1.0× usualOsorno, 24 August: 107.0 µg/m³, 2.3× usualOsorno, 25 August: 145.0 µg/m³, 3.1× usualOsorno, 26 August: 217.0 µg/m³, 4.6× usualOsorno, 27 August: 174.0 µg/m³, 3.7× usualOsorno, 28 August: 35.9 µg/m³, 0.8× usualOsorno, 29 August: no readingOsorno, 30 August: no readingLa UniónLa Unión, 23 August: 46.9 µg/m³, 1.2× usualLa Unión, 24 August: 75.2 µg/m³, 1.9× usualLa Unión, 25 August: 82.3 µg/m³, 2.1× usualLa Unión, 26 August: 91.1 µg/m³, 2.3× usualLa Unión, 27 August: 58.8 µg/m³, 1.5× usualLa Unión, 28 August: 38.7 µg/m³, 1.0× usualLa Unión, 29 August: 65.4 µg/m³, 1.7× usualLa Unión, 30 August: 49.3 µg/m³, 1.3× usualNacimientoNacimiento, 23 August: 71.1 µg/m³, 1.4× usualNacimiento, 24 August: 61.6 µg/m³, 1.2× usualNacimiento, 25 August: 73.3 µg/m³, 1.4× usualNacimiento, 26 August: 119.8 µg/m³, 2.3× usualNacimiento, 27 August: 103.7 µg/m³, 2.0× usualNacimiento, 28 August: 62.3 µg/m³, 1.2× usualNacimiento, 29 August: 48.3 µg/m³, 0.9× usualNacimiento, 30 August: 34.7 µg/m³, 0.7× usualLos ÁngelesLos Ángeles, 23 August: 31.2 µg/m³, 1.1× usualLos Ángeles, 24 August: 30.9 µg/m³, 1.1× usualLos Ángeles, 25 August: 56.1 µg/m³, 2.0× usualLos Ángeles, 26 August: 80.2 µg/m³, 2.8× usualLos Ángeles, 27 August: 103.2 µg/m³, 3.7× usualLos Ángeles, 28 August: 34.0 µg/m³, 1.2× usualLos Ángeles, 29 August: 24.6 µg/m³, 0.9× usualLos Ángeles, 30 August: 21.8 µg/m³, 0.8× usualTemucoTemuco, 23 August: 22.9 µg/m³, 0.6× usualTemuco, 24 August: 27.8 µg/m³, 0.8× usualTemuco, 25 August: 42.2 µg/m³, 1.2× usualTemuco, 26 August: 74.7 µg/m³, 2.1× usualTemuco, 27 August: 61.1 µg/m³, 1.7× usualTemuco, 28 August: 27.2 µg/m³, 0.8× usualTemuco, 29 August: 37.2 µg/m³, 1.0× usualTemuco, 30 August: 21.9 µg/m³, 0.6× usualTalcahuanoTalcahuano, 23 August: 26.8 µg/m³, 1.1× usualTalcahuano, 24 August: 53.5 µg/m³, 2.1× usualTalcahuano, 25 August: 50.9 µg/m³, 2.0× usualTalcahuano, 26 August: 50.7 µg/m³, 2.0× usualTalcahuano, 27 August: 56.9 µg/m³, 2.3× usualTalcahuano, 28 August: 31.0 µg/m³, 1.2× usualTalcahuano, 29 August: 32.6 µg/m³, 1.3× usualTalcahuano, 30 August: 21.3 µg/m³, 0.8× usualChillánChillán, 23 August: 25.0 µg/m³, 0.7× usualChillán, 24 August: 30.6 µg/m³, 0.9× usualChillán, 25 August: 53.3 µg/m³, 1.6× usualChillán, 26 August: 55.8 µg/m³, 1.7× usualChillán, 27 August: 95.3 µg/m³, 2.9× usualChillán, 28 August: 44.6 µg/m³, 1.3× usualChillán, 29 August: 49.4 µg/m³, 1.5× usualChillán, 30 August: 24.2 µg/m³, 0.7× usualSan CarlosSan Carlos, 23 August: 23.0 µg/m³, 0.7× usualSan Carlos, 24 August: 29.5 µg/m³, 0.9× usualSan Carlos, 25 August: 51.2 µg/m³, 1.6× usualSan Carlos, 26 August: 50.8 µg/m³, 1.6× usualSan Carlos, 27 August: 83.1 µg/m³, 2.6× usualSan Carlos, 28 August: 41.4 µg/m³, 1.3× usualSan Carlos, 29 August: 46.7 µg/m³, 1.4× usualSan Carlos, 30 August: 27.3 µg/m³, 0.8× usualCuranilahueCuranilahue, 23 August: 24.6 µg/m³, 0.7× usualCuranilahue, 24 August: 28.5 µg/m³, 0.8× usualCuranilahue, 25 August: 41.8 µg/m³, 1.1× usualCuranilahue, 26 August: 66.2 µg/m³, 1.8× usualCuranilahue, 27 August: 77.8 µg/m³, 2.1× usualCuranilahue, 28 August: 42.5 µg/m³, 1.1× usualCuranilahue, 29 August: 57.7 µg/m³, 1.6× usualCuranilahue, 30 August: 35.4 µg/m³, 1.0× usualToméTomé, 23 August: 19.9 µg/m³, 0.8× usualTomé, 24 August: 25.0 µg/m³, 1.0× usualTomé, 25 August: 34.6 µg/m³, 1.4× usualTomé, 26 August: 43.9 µg/m³, 1.8× usualTomé, 27 August: 49.8 µg/m³, 2.0× usualTomé, 28 August: 23.4 µg/m³, 0.9× usualTomé, 29 August: 40.9 µg/m³, 1.7× usualTomé, 30 August: 22.0 µg/m³, 0.9× usual23 Aug24252627282930
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
OsornoLos Lagos Region, Chile2 217.026 August47.34.6×
Puerto VarasLos Lagos Region, Chile2 179.026 August48.43.7×
Los ÁngelesBiobio, Chile2 103.227 August28.23.7×
ChillánÑuble, Chile1 95.327 August33.42.9×
San CarlosÑuble, Chile1 83.127 August32.32.6×
NacimientoBiobio, Chile2 119.826 August51.22.3×
La UniónLos Ríos Region, Chile1 91.126 August39.22.3×
TalcahuanoBiobio, Chile2 56.927 August25.12.3×
TemucoAraucania, Chile1 74.726 August35.52.1×
CuranilahueBiobio, Chile1 77.827 August37.22.1×
ToméBiobio, Chile1 49.827 August24.72.0×

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 17 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 2023: 11 cities with PM2.5 at twice their usual or more, 26 to 27 August 2023, smogrank.com/episodes/2023-08-south-western-chile-2 (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.