SmogRank / Episodes / Chile

Los Lagos Region and Biobio, Chile, May 2026

For 2 days, from 2 to 3 May 2026, 8 cities in Chile had PM2.5 at least twice their usual for the time of year. The worst reading was Puerto Varas, Los Lagos Region, Chile: 132.0 µg/m³ on 2 May, about 3.4× its usual 39.1.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached8in 1 country
Days22 to 3 May 2026
Worst day2 May4 cities counted
Furthest above usual3.4×Puerto Varas

Day by day

2 May 4 cities at twice their usual or more
TemucoVillarricaLa UniónNacimientoCuranilahueLotaCoronelHualquiChiguayanteConcepciónHualpénToméChillánSan CarlosValdiviaOsornoSan Pedro de la PazTalcahuanoLos ÁngelesPuerto MonttPuerto Varas
29 Apr301 May23456
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, 29 April: 38.2 µg/m³, 1.0× usualPuerto Varas, 30 April: 61.2 µg/m³, 1.6× usualPuerto Varas, 1 May: 51.9 µg/m³, 1.3× usualPuerto Varas, 2 May: 132.0 µg/m³, 3.4× usualPuerto Varas, 3 May: no readingPuerto Varas, 4 May: no readingPuerto Varas, 5 May: 37.6 µg/m³, 1.0× usualPuerto Varas, 6 May: 41.3 µg/m³, 1.1× usualPuerto MonttPuerto Montt, 29 April: 34.9 µg/m³, 1.2× usualPuerto Montt, 30 April: 44.8 µg/m³, 1.5× usualPuerto Montt, 1 May: 45.8 µg/m³, 1.5× usualPuerto Montt, 2 May: 97.4 µg/m³, 3.3× usualPuerto Montt, 3 May: 41.1 µg/m³, 1.4× usualPuerto Montt, 4 May: 32.2 µg/m³, 1.1× usualPuerto Montt, 5 May: 33.6 µg/m³, 1.1× usualPuerto Montt, 6 May: 18.3 µg/m³, 0.6× usualOsornoOsorno, 29 April: 55.8 µg/m³, 1.3× usualOsorno, 30 April: 73.6 µg/m³, 1.8× usualOsorno, 1 May: 50.2 µg/m³, 1.2× usualOsorno, 2 May: 92.8 µg/m³, 2.2× usualOsorno, 3 May: 81.6 µg/m³, 2.0× usualOsorno, 4 May: 40.3 µg/m³, 1.0× usualOsorno, 5 May: 51.5 µg/m³, 1.2× usualOsorno, 6 May: 31.1 µg/m³, 0.7× usualValdiviaValdivia, 29 April: 48.5 µg/m³, 1.6× usualValdivia, 30 April: 49.7 µg/m³, 1.6× usualValdivia, 1 May: 36.0 µg/m³, 1.2× usualValdivia, 2 May: 65.0 µg/m³, 2.1× usualValdivia, 3 May: 61.8 µg/m³, 2.0× usualValdivia, 4 May: 35.4 µg/m³, 1.1× usualValdivia, 5 May: 47.0 µg/m³, 1.5× usualValdivia, 6 May: 27.7 µg/m³, 0.9× usualSan CarlosSan Carlos, 29 April: 24.7 µg/m³, 0.6× usualSan Carlos, 30 April: 31.8 µg/m³, 0.8× usualSan Carlos, 1 May: 29.9 µg/m³, 0.7× usualSan Carlos, 2 May: 33.5 µg/m³, 0.8× usualSan Carlos, 3 May: 85.4 µg/m³, 2.1× usualSan Carlos, 4 May: 31.2 µg/m³, 0.8× usualSan Carlos, 5 May: 52.9 µg/m³, 1.3× usualSan Carlos, 6 May: 20.5 µg/m³, 0.5× usualLos ÁngelesLos Ángeles, 29 April: 24.5 µg/m³, 0.8× usualLos Ángeles, 30 April: 29.0 µg/m³, 0.9× usualLos Ángeles, 1 May: 55.2 µg/m³, 1.8× usualLos Ángeles, 2 May: 33.1 µg/m³, 1.1× usualLos Ángeles, 3 May: 77.5 µg/m³, 2.5× usualLos Ángeles, 4 May: 39.6 µg/m³, 1.3× usualLos Ángeles, 5 May: 41.6 µg/m³, 1.3× usualLos Ángeles, 6 May: 28.4 µg/m³, 0.9× usualTalcahuanoTalcahuano, 29 April: 19.7 µg/m³, 0.6× usualTalcahuano, 30 April: 29.3 µg/m³, 1.0× usualTalcahuano, 1 May: 30.7 µg/m³, 1.0× usualTalcahuano, 2 May: 25.9 µg/m³, 0.8× usualTalcahuano, 3 May: 74.8 µg/m³, 2.4× usualTalcahuano, 4 May: 26.3 µg/m³, 0.9× usualTalcahuano, 5 May: 33.5 µg/m³, 1.1× usualTalcahuano, 6 May: 17.0 µg/m³, 0.6× usualSan Pedro de la PazSan Pedro de la Paz, 29 April: 17.3 µg/m³, 0.7× usualSan Pedro de la Paz, 30 April: 24.0 µg/m³, 1.0× usualSan Pedro de la Paz, 1 May: 27.4 µg/m³, 1.2× usualSan Pedro de la Paz, 2 May: 22.4 µg/m³, 0.9× usualSan Pedro de la Paz, 3 May: 55.3 µg/m³, 2.3× usualSan Pedro de la Paz, 4 May: 27.2 µg/m³, 1.1× usualSan Pedro de la Paz, 5 May: 30.8 µg/m³, 1.3× usualSan Pedro de la Paz, 6 May: 18.4 µg/m³, 0.8× usual29 Apr301 May23456
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
Puerto VarasLos Lagos Region, Chile1 132.02 May39.13.4×
Puerto MonttLos Lagos Region, Chile1 97.42 May29.93.3×
Los ÁngelesBiobio, Chile1 77.53 May31.32.5×
TalcahuanoBiobio, Chile1 74.83 May30.62.4×
San Pedro de la PazBiobio, Chile1 55.33 May23.82.3×
OsornoLos Lagos Region, Chile1 92.82 May41.52.2×
ValdiviaLos Ríos Region, Chile1 65.02 May30.82.1×
San CarlosÑuble, Chile1 85.43 May40.92.1×

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 11 of 11 episodes in Chile since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading.

Use this page

SmogRank, Los Lagos Region and Biobio, Chile, May 2026: 8 cities with PM2.5 at twice their usual or more, 2 to 3 May 2026, smogrank.com/episodes/2026-05-los-lagos-region-and-biobio-chile (accessed 2 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.