SmogRank / Episodes / Chile

South-western Chile, 10 to 12 May 2024

For 3 days, from 10 to 12 May 2024, 9 cities in Chile had PM2.5 at least twice their usual for the time of year. The worst reading was Nacimiento, Biobio, Chile: 139.0 µg/m³ on 12 May, about 2.2× its usual 63.4.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached9in 1 country
Days310 to 12 May 2024
Worst day10 May6 cities counted
Furthest above usual3.0×Los Ángeles

Day by day

10 May 6 cities at twice their usual or more
TemucoValdiviaLa UniónCuranilahueOsornoCoronelChiguayanteConcepciónToméPuerto MonttSan Pedro de la PazPuerto VarasNacimientoSan CarlosVillarricaHualpénTalcahuanoChillánLos Ángeles
7 May89101112131415
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, 7 May: 30.5 µg/m³Hualpén, 8 May: 94.3 µg/m³Hualpén, 9 May: 67.7 µg/m³Hualpén, 10 May: 121.0 µg/m³, 2.6× its usual 46.6Hualpén, 11 May: 110.0 µg/m³, 2.3× its usual 47.6Hualpén, 12 May: 102.0 µg/m³, 2.1× its usual 47.8Hualpén, 13 May: 62.6 µg/m³Hualpén, 14 May: 93.3 µg/m³Hualpén, 15 May: 129.0 µg/m³VillarricaVillarrica, 7 May: no readingVillarrica, 8 May: no readingVillarrica, 9 May: 39.2 µg/m³Villarrica, 10 May: 104.0 µg/m³, 2.5× its usual 42.0Villarrica, 11 May: 108.0 µg/m³, 2.5× its usual 42.4Villarrica, 12 May: 53.5 µg/m³Villarrica, 13 May: 41.3 µg/m³Villarrica, 14 May: 73.4 µg/m³Villarrica, 15 May: 92.9 µg/m³Los ÁngelesLos Ángeles, 7 May: 15.3 µg/m³Los Ángeles, 8 May: 30.5 µg/m³Los Ángeles, 9 May: 58.8 µg/m³Los Ángeles, 10 May: 99.1 µg/m³, 3.0× its usual 33.0Los Ángeles, 11 May: 91.9 µg/m³, 2.7× its usual 34.1Los Ángeles, 12 May: 64.1 µg/m³Los Ángeles, 13 May: 27.1 µg/m³Los Ángeles, 14 May: 44.2 µg/m³Los Ángeles, 15 May: 119.9 µg/m³Puerto VarasPuerto Varas, 7 May: 22.6 µg/m³Puerto Varas, 8 May: 33.7 µg/m³Puerto Varas, 9 May: 38.3 µg/m³Puerto Varas, 10 May: 91.4 µg/m³, 2.1× its usual 44.0Puerto Varas, 11 May: 56.9 µg/m³Puerto Varas, 12 May: 62.0 µg/m³Puerto Varas, 13 May: 87.3 µg/m³Puerto Varas, 14 May: 74.4 µg/m³Puerto Varas, 15 May: 52.2 µg/m³ChillánChillán, 7 May: 19.7 µg/m³Chillán, 8 May: 28.4 µg/m³Chillán, 9 May: 45.2 µg/m³Chillán, 10 May: 87.1 µg/m³, 2.2× its usual 39.0Chillán, 11 May: 118.3 µg/m³, 2.9× its usual 40.5Chillán, 12 May: 104.2 µg/m³, 2.6× its usual 40.5Chillán, 13 May: 44.0 µg/m³Chillán, 14 May: 102.6 µg/m³Chillán, 15 May: 87.8 µg/m³San Pedro de la PazSan Pedro de la Paz, 7 May: 19.2 µg/m³San Pedro de la Paz, 8 May: 34.3 µg/m³San Pedro de la Paz, 9 May: 29.9 µg/m³San Pedro de la Paz, 10 May: 53.7 µg/m³, 2.1× its usual 25.5San Pedro de la Paz, 11 May: 38.0 µg/m³San Pedro de la Paz, 12 May: 38.5 µg/m³San Pedro de la Paz, 13 May: 30.3 µg/m³San Pedro de la Paz, 14 May: 37.6 µg/m³San Pedro de la Paz, 15 May: 46.3 µg/m³San CarlosSan Carlos, 7 May: 14.7 µg/m³San Carlos, 8 May: 25.3 µg/m³San Carlos, 9 May: 40.9 µg/m³San Carlos, 10 May: 86.1 µg/m³San Carlos, 11 May: 102.0 µg/m³, 2.3× its usual 43.8San Carlos, 12 May: 73.1 µg/m³San Carlos, 13 May: 58.2 µg/m³San Carlos, 14 May: 113.0 µg/m³San Carlos, 15 May: 56.2 µg/m³TalcahuanoTalcahuano, 7 May: 20.6 µg/m³Talcahuano, 8 May: 69.8 µg/m³Talcahuano, 9 May: 62.7 µg/m³Talcahuano, 10 May: 62.1 µg/m³Talcahuano, 11 May: 95.3 µg/m³, 2.9× its usual 33.2Talcahuano, 12 May: 88.7 µg/m³, 2.7× its usual 33.2Talcahuano, 13 May: 49.7 µg/m³Talcahuano, 14 May: 51.7 µg/m³Talcahuano, 15 May: 104.2 µg/m³NacimientoNacimiento, 7 May: 67.0 µg/m³Nacimiento, 8 May: 53.3 µg/m³Nacimiento, 9 May: 143.0 µg/m³Nacimiento, 10 May: 109.0 µg/m³Nacimiento, 11 May: 100.3 µg/m³Nacimiento, 12 May: 139.0 µg/m³, 2.2× its usual 63.4Nacimiento, 13 May: 82.2 µg/m³Nacimiento, 14 May: 126.4 µg/m³Nacimiento, 15 May: 120.0 µg/m³7 May89101112131415
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 99.110 May33.03.0×
ChillánÑuble, Chile3 118.311 May40.52.9×
TalcahuanoBiobio, Chile2 95.311 May33.22.9×
HualpénBiobio, Chile3 121.010 May46.62.6×
VillarricaAraucania, Chile2 108.011 May42.42.5×
San CarlosÑuble, Chile1 102.011 May43.82.3×
NacimientoBiobio, Chile1 139.012 May63.42.2×
Puerto VarasLos Lagos Region, Chile1 91.410 May44.02.1×
San Pedro de la PazBiobio, Chile1 53.710 May25.52.1×

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 25 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, 10 to 12 May 2024: 9 cities with PM2.5 at twice their usual or more, 10 to 12 May 2024, smogrank.com/episodes/2024-05-10-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.