SmogRank / Episodes / Chile

South-western Chile, August 2024

For 2 days, from 12 to 13 August 2024, 8 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: 139.5 µg/m³ on 12 August, about 2.9× its usual 48.7.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached8in 1 country
Days212 to 13 August 2024
Worst day13 August7 cities counted
Furthest above usual3.5×Villarrica

Day by day

13 August 7 cities at twice their usual or more
NacimientoLos ÁngelesCuranilahueCoronelHualquiSan Pedro de la PazConcepciónHualpénTalcahuanoChillánPuerto MonttToméLa UniónValdiviaTemucoPuerto VarasChiguayanteOsornoVillarrica
9 Aug10111213141516
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

VillarricaVillarrica, 9 August: 84.1 µg/m³, 2.4× usualVillarrica, 10 August: 47.8 µg/m³, 1.4× usualVillarrica, 11 August: 47.3 µg/m³, 1.3× usualVillarrica, 12 August: 55.6 µg/m³, 1.6× usualVillarrica, 13 August: 123.0 µg/m³, 3.5× usualVillarrica, 14 August: 70.9 µg/m³, 2.0× usualVillarrica, 15 August: 115.0 µg/m³, 3.3× usualVillarrica, 16 August: 84.2 µg/m³, 2.4× usualTemucoTemuco, 9 August: 82.3 µg/m³, 2.4× usualTemuco, 10 August: 48.2 µg/m³, 1.4× usualTemuco, 11 August: 55.6 µg/m³, 1.6× usualTemuco, 12 August: 73.7 µg/m³, 2.2× usualTemuco, 13 August: 80.5 µg/m³, 2.4× usualTemuco, 14 August: 59.3 µg/m³, 1.7× usualTemuco, 15 August: 51.8 µg/m³, 1.5× usualTemuco, 16 August: 21.1 µg/m³, 0.6× usualToméTomé, 9 August: 52.3 µg/m³, 2.1× usualTomé, 10 August: 32.7 µg/m³, 1.3× usualTomé, 11 August: 35.0 µg/m³, 1.4× usualTomé, 12 August: 37.2 µg/m³, 1.5× usualTomé, 13 August: 54.4 µg/m³, 2.2× usualTomé, 14 August: 26.0 µg/m³, 1.0× usualTomé, 15 August: 35.2 µg/m³, 1.4× usualTomé, 16 August: no readingOsornoOsorno, 9 August: 48.4 µg/m³, 1.0× usualOsorno, 10 August: 32.4 µg/m³, 0.7× usualOsorno, 11 August: 82.9 µg/m³, 1.7× usualOsorno, 12 August: 139.5 µg/m³, 2.9× usualOsorno, 13 August: 78.9 µg/m³, 1.6× usualOsorno, 14 August: 55.7 µg/m³, 1.1× usualOsorno, 15 August: 97.6 µg/m³, 2.0× usualOsorno, 16 August: 86.9 µg/m³, 1.8× usualPuerto VarasPuerto Varas, 9 August: 47.4 µg/m³, 1.0× usualPuerto Varas, 10 August: 34.8 µg/m³, 0.7× usualPuerto Varas, 11 August: 72.0 µg/m³, 1.5× usualPuerto Varas, 12 August: 128.0 µg/m³, 2.7× usualPuerto Varas, 13 August: 90.5 µg/m³, 1.9× usualPuerto Varas, 14 August: 52.3 µg/m³, 1.1× usualPuerto Varas, 15 August: 105.0 µg/m³, 2.2× usualPuerto Varas, 16 August: 101.0 µg/m³, 2.1× usualLa UniónLa Unión, 9 August: 46.3 µg/m³, 1.2× usualLa Unión, 10 August: 36.8 µg/m³, 1.0× usualLa Unión, 11 August: 60.2 µg/m³, 1.6× usualLa Unión, 12 August: 86.5 µg/m³, 2.2× usualLa Unión, 13 August: 81.4 µg/m³, 2.1× usualLa Unión, 14 August: 41.3 µg/m³, 1.1× usualLa Unión, 15 August: 62.5 µg/m³, 1.6× usualLa Unión, 16 August: no readingValdiviaValdivia, 9 August: 35.8 µg/m³, 0.9× usualValdivia, 10 August: 27.3 µg/m³, 0.7× usualValdivia, 11 August: 56.8 µg/m³, 1.4× usualValdivia, 12 August: 76.7 µg/m³, 2.0× usualValdivia, 13 August: 90.3 µg/m³, 2.3× usualValdivia, 14 August: 61.1 µg/m³, 1.6× usualValdivia, 15 August: 71.6 µg/m³, 1.8× usualValdivia, 16 August: 63.6 µg/m³, 1.6× usualChiguayanteChiguayante, 9 August: 46.0 µg/m³, 1.9× usualChiguayante, 10 August: 34.4 µg/m³, 1.5× usualChiguayante, 11 August: 30.9 µg/m³, 1.3× usualChiguayante, 12 August: no readingChiguayante, 13 August: 68.9 µg/m³, 2.9× usualChiguayante, 14 August: 29.6 µg/m³, 1.2× usualChiguayante, 15 August: 35.3 µg/m³, 1.5× usualChiguayante, 16 August: 44.7 µg/m³, 1.9× usual9 Aug10111213141516
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
VillarricaAraucania, Chile1 123.013 August35.13.5×
ChiguayanteBiobio, Chile1 68.913 August23.72.9×
OsornoLos Lagos Region, Chile1 139.512 August48.72.9×
Puerto VarasLos Lagos Region, Chile2 128.012 August48.32.7×
TemucoAraucania, Chile2 82.39 August33.92.4×
ValdiviaLos Ríos Region, Chile1 90.313 August39.22.3×
La UniónLos Ríos Region, Chile2 86.512 August38.52.2×
ToméBiobio, Chile1 54.413 August25.02.2×

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 28 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 2024: 8 cities with PM2.5 at twice their usual or more, 12 to 13 August 2024, smogrank.com/episodes/2024-08-south-western-chile-2 (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.