SmogRank / Episodes / Chile

South-western Chile, 7 to 8 August 2023

For 2 days, from 7 to 8 August 2023, 12 cities in Chile had PM2.5 at least twice their usual for the time of year. The worst reading was Temuco, Araucania, Chile: 148.5 µg/m³ on 7 August, about 3.8× its usual 38.8.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached12in 1 country
Days27 to 8 August 2023
Worst day8 August10 cities counted
Furthest above usual3.8×Temuco

Day by day

8 August 10 cities at twice their usual or more
LotaHualquiCoronelChiguayanteConcepciónSan Pedro de la PazChillánToméPuerto VarasTalcaValdiviaCauquenesSan CarlosLos ÁngelesLinaresCuranilahueLa UniónNacimientoTalcahuanoOsornoPuerto MonttTemuco
4 Aug567891011
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

TemucoTemuco, 4 August: 49.6 µg/m³Temuco, 5 August: 62.5 µg/m³Temuco, 6 August: 102.0 µg/m³Temuco, 7 August: 148.5 µg/m³, 3.8× its usual 38.8Temuco, 8 August: 96.2 µg/m³, 2.5× its usual 38.8Temuco, 9 August: 65.1 µg/m³Temuco, 10 August: 25.9 µg/m³Temuco, 11 August: 27.4 µg/m³NacimientoNacimiento, 4 August: 45.1 µg/m³Nacimiento, 5 August: 90.8 µg/m³Nacimiento, 6 August: 88.0 µg/m³Nacimiento, 7 August: 144.4 µg/m³, 2.3× its usual 63.2Nacimiento, 8 August: 136.0 µg/m³, 2.2× its usual 61.6Nacimiento, 9 August: 91.9 µg/m³Nacimiento, 10 August: 37.9 µg/m³Nacimiento, 11 August: 69.2 µg/m³OsornoOsorno, 4 August: 112.0 µg/m³Osorno, 5 August: 49.1 µg/m³Osorno, 6 August: 94.2 µg/m³Osorno, 7 August: 140.0 µg/m³, 2.7× its usual 51.9Osorno, 8 August: 140.0 µg/m³, 2.8× its usual 50.8Osorno, 9 August: 42.7 µg/m³Osorno, 10 August: 31.5 µg/m³Osorno, 11 August: 54.3 µg/m³Puerto MonttPuerto Montt, 4 August: 91.1 µg/m³Puerto Montt, 5 August: 25.0 µg/m³Puerto Montt, 6 August: 25.8 µg/m³Puerto Montt, 7 August: 109.8 µg/m³, 3.0× its usual 36.8Puerto Montt, 8 August: 50.0 µg/m³Puerto Montt, 9 August: 21.8 µg/m³Puerto Montt, 10 August: 25.0 µg/m³Puerto Montt, 11 August: 59.3 µg/m³La UniónLa Unión, 4 August: 83.9 µg/m³La Unión, 5 August: 51.0 µg/m³La Unión, 6 August: 75.8 µg/m³La Unión, 7 August: 95.1 µg/m³, 2.3× its usual 41.0La Unión, 8 August: 80.0 µg/m³La Unión, 9 August: 34.1 µg/m³La Unión, 10 August: 31.2 µg/m³La Unión, 11 August: 54.7 µg/m³CuranilahueCuranilahue, 4 August: 42.4 µg/m³Curanilahue, 5 August: 67.7 µg/m³Curanilahue, 6 August: 69.3 µg/m³Curanilahue, 7 August: 91.4 µg/m³, 2.3× its usual 39.5Curanilahue, 8 August: 81.9 µg/m³, 2.1× its usual 39.2Curanilahue, 9 August: 51.4 µg/m³Curanilahue, 10 August: 30.0 µg/m³Curanilahue, 11 August: 33.4 µg/m³Los ÁngelesLos Ángeles, 4 August: 22.3 µg/m³Los Ángeles, 5 August: 52.8 µg/m³Los Ángeles, 6 August: 69.9 µg/m³Los Ángeles, 7 August: 73.6 µg/m³, 2.2× its usual 33.8Los Ángeles, 8 August: 77.7 µg/m³, 2.3× its usual 33.5Los Ángeles, 9 August: 63.2 µg/m³Los Ángeles, 10 August: 23.7 µg/m³Los Ángeles, 11 August: 26.4 µg/m³TalcahuanoTalcahuano, 4 August: 36.6 µg/m³Talcahuano, 5 August: 43.8 µg/m³Talcahuano, 6 August: 42.3 µg/m³Talcahuano, 7 August: 61.2 µg/m³, 2.1× its usual 29.0Talcahuano, 8 August: 70.9 µg/m³, 2.4× its usual 29.0Talcahuano, 9 August: 29.5 µg/m³Talcahuano, 10 August: 18.0 µg/m³Talcahuano, 11 August: 43.4 µg/m³LinaresLinares, 4 August: 46.4 µg/m³Linares, 5 August: 73.7 µg/m³Linares, 6 August: 56.3 µg/m³Linares, 7 August: 50.1 µg/m³Linares, 8 August: 83.5 µg/m³, 2.3× its usual 36.8Linares, 9 August: 80.4 µg/m³Linares, 10 August: 33.2 µg/m³Linares, 11 August: 40.8 µg/m³ValdiviaValdivia, 4 August: 54.9 µg/m³Valdivia, 5 August: 29.2 µg/m³Valdivia, 6 August: 60.9 µg/m³Valdivia, 7 August: 59.1 µg/m³Valdivia, 8 August: 82.9 µg/m³, 2.0× its usual 41.0Valdivia, 9 August: 56.4 µg/m³Valdivia, 10 August: 30.3 µg/m³Valdivia, 11 August: 44.8 µg/m³San CarlosSan Carlos, 4 August: no readingSan Carlos, 5 August: 104.0 µg/m³San Carlos, 6 August: 49.3 µg/m³San Carlos, 7 August: 51.5 µg/m³San Carlos, 8 August: 78.2 µg/m³, 2.2× its usual 35.7San Carlos, 9 August: 63.3 µg/m³San Carlos, 10 August: 25.3 µg/m³San Carlos, 11 August: 50.0 µg/m³CauquenesCauquenes, 4 August: 32.6 µg/m³Cauquenes, 5 August: 44.8 µg/m³Cauquenes, 6 August: 52.4 µg/m³Cauquenes, 7 August: 49.7 µg/m³Cauquenes, 8 August: 64.8 µg/m³, 2.1× its usual 31.0Cauquenes, 9 August: 65.1 µg/m³Cauquenes, 10 August: 27.7 µg/m³Cauquenes, 11 August: 31.6 µg/m³4 Aug567891011
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
TemucoAraucania, Chile2 148.57 August38.83.8×
Puerto MonttLos Lagos Region, Chile1 109.87 August36.83.0×
OsornoLos Lagos Region, Chile2 140.07 August51.92.7×
TalcahuanoBiobio, Chile2 70.98 August29.02.4×
NacimientoBiobio, Chile2 144.47 August63.22.3×
La UniónLos Ríos Region, Chile1 95.17 August41.02.3×
CuranilahueBiobio, Chile2 91.47 August39.52.3×
LinaresMaule Region, Chile1 83.58 August36.82.3×
Los ÁngelesBiobio, Chile2 77.78 August33.52.3×
San CarlosÑuble, Chile1 78.28 August35.72.2×
CauquenesMaule Region, Chile1 64.88 August31.02.1×
ValdiviaLos Ríos Region, Chile1 82.98 August41.02.0×

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 Chile

Number 14 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, 7 to 8 August 2023: 12 cities with PM2.5 at twice their usual or more, 7 to 8 August 2023, smogrank.com/episodes/2023-08-07-south-western-chile (accessed 4 October 2026).

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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.