SmogRank / Episodes / Chile

Biobio and Araucania, Chile, August 2024

For 2 days, from 24 to 25 August 2024, 9 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: 142.0 µg/m³ on 25 August, about 3.1× its usual 46.1.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached9in 1 country
Days224 to 25 August 2024
Worst day25 August8 cities counted
Furthest above usual3.2×Talcahuano

Day by day

25 August 8 cities at twice their usual or more
Los ÁngelesLotaCoronelHualquiChiguayanteLa UniónSan Pedro de la PazConcepciónChillánToméTemucoHualpénValdiviaNacimientoCuranilahueVillarricaOsornoTalcahuano
21 Aug22232425262728
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

HualpénHualpén, 21 August: 60.8 µg/m³, 1.4× usualHualpén, 22 August: 84.3 µg/m³, 2.0× usualHualpén, 23 August: 44.4 µg/m³, 1.0× usualHualpén, 24 August: 74.8 µg/m³, 1.7× usualHualpén, 25 August: 94.5 µg/m³, 2.2× usualHualpén, 26 August: 31.7 µg/m³, 0.7× usualHualpén, 27 August: 37.3 µg/m³, 0.9× usualHualpén, 28 August: 56.9 µg/m³, 1.3× usualOsornoOsorno, 21 August: 80.8 µg/m³, 1.8× usualOsorno, 22 August: 77.1 µg/m³, 1.7× usualOsorno, 23 August: 81.4 µg/m³, 1.8× usualOsorno, 24 August: 107.0 µg/m³, 2.3× usualOsorno, 25 August: 142.0 µg/m³, 3.1× usualOsorno, 26 August: 39.1 µg/m³, 0.8× usualOsorno, 27 August: 64.8 µg/m³, 1.4× usualOsorno, 28 August: 54.3 µg/m³, 1.2× usualVillarricaVillarrica, 21 August: 68.8 µg/m³, 1.8× usualVillarrica, 22 August: 35.1 µg/m³, 0.9× usualVillarrica, 23 August: 53.6 µg/m³, 1.4× usualVillarrica, 24 August: 99.8 µg/m³, 2.6× usualVillarrica, 25 August: 84.6 µg/m³, 2.2× usualVillarrica, 26 August: 41.0 µg/m³, 1.1× usualVillarrica, 27 August: 54.6 µg/m³, 1.4× usualVillarrica, 28 August: 28.5 µg/m³, 0.7× usualTalcahuanoTalcahuano, 21 August: 19.6 µg/m³, 0.8× usualTalcahuano, 22 August: 44.9 µg/m³, 1.8× usualTalcahuano, 23 August: 38.6 µg/m³, 1.5× usualTalcahuano, 24 August: 81.3 µg/m³, 3.2× usualTalcahuano, 25 August: 68.5 µg/m³, 2.7× usualTalcahuano, 26 August: 21.4 µg/m³, 0.8× usualTalcahuano, 27 August: 25.2 µg/m³, 1.0× usualTalcahuano, 28 August: 36.7 µg/m³, 1.4× usualToméTomé, 21 August: 20.3 µg/m³, 0.8× usualTomé, 22 August: 21.3 µg/m³, 0.8× usualTomé, 23 August: 30.5 µg/m³, 1.2× usualTomé, 24 August: 50.4 µg/m³, 2.0× usualTomé, 25 August: 32.0 µg/m³, 1.3× usualTomé, 26 August: 19.1 µg/m³, 0.8× usualTomé, 27 August: 18.3 µg/m³, 0.7× usualTomé, 28 August: 20.8 µg/m³, 0.8× usualNacimientoNacimiento, 21 August: 61.4 µg/m³, 1.2× usualNacimiento, 22 August: 41.0 µg/m³, 0.8× usualNacimiento, 23 August: 46.0 µg/m³, 0.9× usualNacimiento, 24 August: 77.9 µg/m³, 1.5× usualNacimiento, 25 August: 116.7 µg/m³, 2.3× usualNacimiento, 26 August: 43.1 µg/m³, 0.8× usualNacimiento, 27 August: 45.6 µg/m³, 0.9× usualNacimiento, 28 August: 63.2 µg/m³, 1.2× usualCuranilahueCuranilahue, 21 August: 39.7 µg/m³, 1.1× usualCuranilahue, 22 August: 60.7 µg/m³, 1.6× usualCuranilahue, 23 August: 40.3 µg/m³, 1.1× usualCuranilahue, 24 August: 67.3 µg/m³, 1.8× usualCuranilahue, 25 August: 91.2 µg/m³, 2.5× usualCuranilahue, 26 August: 36.5 µg/m³, 1.0× usualCuranilahue, 27 August: 38.6 µg/m³, 1.0× usualCuranilahue, 28 August: 38.3 µg/m³, 1.0× usualValdiviaValdivia, 21 August: 62.5 µg/m³, 1.6× usualValdivia, 22 August: 46.1 µg/m³, 1.2× usualValdivia, 23 August: 53.5 µg/m³, 1.4× usualValdivia, 24 August: 66.0 µg/m³, 1.7× usualValdivia, 25 August: 87.7 µg/m³, 2.2× usualValdivia, 26 August: 35.4 µg/m³, 0.9× usualValdivia, 27 August: 77.0 µg/m³, 2.0× usualValdivia, 28 August: 28.5 µg/m³, 0.7× usualTemucoTemuco, 21 August: 40.4 µg/m³, 1.2× usualTemuco, 22 August: 25.3 µg/m³, 0.7× usualTemuco, 23 August: 36.0 µg/m³, 1.1× usualTemuco, 24 August: 60.1 µg/m³, 1.8× usualTemuco, 25 August: 71.1 µg/m³, 2.1× usualTemuco, 26 August: 37.7 µg/m³, 1.1× usualTemuco, 27 August: 48.8 µg/m³, 1.4× usualTemuco, 28 August: 53.8 µg/m³, 1.6× usual21 Aug22232425262728
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
TalcahuanoBiobio, Chile2 81.324 August25.53.2×
OsornoLos Lagos Region, Chile2 142.025 August46.13.1×
VillarricaAraucania, Chile2 99.824 August38.82.6×
CuranilahueBiobio, Chile1 91.225 August37.12.5×
NacimientoBiobio, Chile1 116.725 August51.32.3×
ValdiviaLos Ríos Region, Chile1 87.725 August39.32.2×
HualpénBiobio, Chile1 94.525 August43.22.2×
TemucoAraucania, Chile1 71.125 August33.92.1×
ToméBiobio, Chile1 50.424 August25.22.0×

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 23 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, Biobio and Araucania, Chile, August 2024: 9 cities with PM2.5 at twice their usual or more, 24 to 25 August 2024, smogrank.com/episodes/2024-08-biobio-and-araucania-chile (accessed 3 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.