SmogRank / Episodes / Chile
South-western Chile, June 2023
For 4 days, from 17 to 20 June 2023, 14 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: 212.0 µg/m³ on 20 June, about 3.9× its usual 54.8.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 14 in 1 country
Days 4 17 to 20 June 2023
Worst day 20 June 9 cities counted
Furthest above usual 3.9× Chillán
Day by day
Play 20 June 9 cities at twice their usual or more
Hualqui Coronel Valdivia Chiguayante Concepción San Pedro de la Paz Hualpén Talcahuano Tomé Curicó Linares Talca Osorno Lota Cauquenes La Unión Nacimiento Temuco Los Ángeles Chillán San Carlos Curanilahue Puerto Montt Puerto Varas 14 Jun 15 16 17 18 19 20 21 22 23 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
Chillán Chillán, 14 June: 207.0 µg/m³, 5.1× usual Chillán, 15 June: 75.3 µg/m³, 1.8× usual Chillán, 16 June: 35.2 µg/m³, 0.9× usual Chillán, 17 June: 67.5 µg/m³, 1.7× usual Chillán, 18 June: 125.7 µg/m³, 3.1× usual Chillán, 19 June: 131.5 µg/m³, 3.2× usual Chillán, 20 June: 102.7 µg/m³, 2.5× usual Chillán, 21 June: 55.4 µg/m³, 1.4× usual Chillán, 22 June: no reading Chillán, 23 June: 18.8 µg/m³, 0.5× usual San Carlos San Carlos, 14 June: 165.0 µg/m³, 3.6× usual San Carlos, 15 June: 73.1 µg/m³, 1.6× usual San Carlos, 16 June: 45.8 µg/m³, 1.0× usual San Carlos, 17 June: 70.5 µg/m³, 1.6× usual San Carlos, 18 June: 146.0 µg/m³, 3.2× usual San Carlos, 19 June: 153.0 µg/m³, 3.4× usual San Carlos, 20 June: 110.0 µg/m³, 2.4× usual San Carlos, 21 June: 50.9 µg/m³, 1.1× usual San Carlos, 22 June: no reading San Carlos, 23 June: 12.8 µg/m³, 0.3× usual Temuco Temuco, 14 June: 141.0 µg/m³, 2.7× usual Temuco, 15 June: 133.0 µg/m³, 2.6× usual Temuco, 16 June: 49.8 µg/m³, 1.0× usual Temuco, 17 June: 104.0 µg/m³, 2.0× usual Temuco, 18 June: 143.0 µg/m³, 2.7× usual Temuco, 19 June: 131.0 µg/m³, 2.5× usual Temuco, 20 June: 155.0 µg/m³, 3.0× usual Temuco, 21 June: 81.0 µg/m³, 1.6× usual Temuco, 22 June: no reading Temuco, 23 June: 25.8 µg/m³, 0.5× usual Linares Linares, 14 June: 137.0 µg/m³, 2.4× usual Linares, 15 June: 136.0 µg/m³, 2.4× usual Linares, 16 June: 75.0 µg/m³, 1.3× usual Linares, 17 June: 42.8 µg/m³, 0.7× usual Linares, 18 June: 47.0 µg/m³, 0.8× usual Linares, 19 June: 92.4 µg/m³, 1.6× usual Linares, 20 June: 116.0 µg/m³, 2.0× usual Linares, 21 June: 83.0 µg/m³, 1.4× usual Linares, 22 June: no reading Linares, 23 June: no reading Lota Lota, 14 June: 49.0 µg/m³, 2.5× usual Lota, 15 June: 33.6 µg/m³, 1.7× usual Lota, 16 June: 25.3 µg/m³, 1.3× usual Lota, 17 June: 35.3 µg/m³, 1.8× usual Lota, 18 June: 41.9 µg/m³, 2.1× usual Lota, 19 June: 31.3 µg/m³, 1.6× usual Lota, 20 June: 26.9 µg/m³, 1.4× usual Lota, 21 June: 27.3 µg/m³, 1.4× usual Lota, 22 June: no reading Lota, 23 June: 13.0 µg/m³, 0.7× usual Osorno Osorno, 14 June: 69.0 µg/m³, 1.1× usual Osorno, 15 June: 44.7 µg/m³, 0.7× usual Osorno, 16 June: 39.1 µg/m³, 0.6× usual Osorno, 17 June: 132.0 µg/m³, 2.0× usual Osorno, 18 June: 86.2 µg/m³, 1.3× usual Osorno, 19 June: 74.6 µg/m³, 1.2× usual Osorno, 20 June: 125.0 µg/m³, 1.9× usual Osorno, 21 June: 48.0 µg/m³, 0.7× usual Osorno, 22 June: no reading Osorno, 23 June: 37.7 µg/m³, 0.6× usual Puerto Montt Puerto Montt, 14 June: 46.5 µg/m³, 1.2× usual Puerto Montt, 15 June: 34.7 µg/m³, 0.9× usual Puerto Montt, 16 June: 36.1 µg/m³, 1.0× usual Puerto Montt, 17 June: 127.6 µg/m³, 3.4× usual Puerto Montt, 18 June: 136.0 µg/m³, 3.6× usual Puerto Montt, 19 June: 64.0 µg/m³, 1.7× usual Puerto Montt, 20 June: 114.3 µg/m³, 3.1× usual Puerto Montt, 21 June: 34.9 µg/m³, 0.9× usual Puerto Montt, 22 June: no reading Puerto Montt, 23 June: 37.2 µg/m³, 1.0× usual Puerto Varas Puerto Varas, 14 June: 56.1 µg/m³, 1.0× usual Puerto Varas, 15 June: 35.2 µg/m³, 0.6× usual Puerto Varas, 16 June: 55.2 µg/m³, 1.0× usual Puerto Varas, 17 June: 115.0 µg/m³, 2.1× usual Puerto Varas, 18 June: 114.0 µg/m³, 2.1× usual Puerto Varas, 19 June: 87.5 µg/m³, 1.6× usual Puerto Varas, 20 June: 212.0 µg/m³, 3.9× usual Puerto Varas, 21 June: 30.5 µg/m³, 0.6× usual Puerto Varas, 22 June: no reading Puerto Varas, 23 June: 100.0 µg/m³, 1.8× usual La Unión La Unión, 14 June: 73.5 µg/m³, 1.5× usual La Unión, 15 June: 43.1 µg/m³, 0.9× usual La Unión, 16 June: 44.6 µg/m³, 0.9× usual La Unión, 17 June: 109.0 µg/m³, 2.2× usual La Unión, 18 June: 68.9 µg/m³, 1.4× usual La Unión, 19 June: 54.0 µg/m³, 1.1× usual La Unión, 20 June: 53.3 µg/m³, 1.1× usual La Unión, 21 June: 42.3 µg/m³, 0.9× usual La Unión, 22 June: no reading La Unión, 23 June: 39.0 µg/m³, 0.8× usual Cauquenes Cauquenes, 14 June: 47.6 µg/m³, 1.1× usual Cauquenes, 15 June: 51.9 µg/m³, 1.2× usual Cauquenes, 16 June: 49.4 µg/m³, 1.2× usual Cauquenes, 17 June: 85.5 µg/m³, 2.0× usual Cauquenes, 18 June: 73.0 µg/m³, 1.7× usual Cauquenes, 19 June: 92.2 µg/m³, 2.2× usual Cauquenes, 20 June: 72.9 µg/m³, 1.7× usual Cauquenes, 21 June: 42.6 µg/m³, 1.0× usual Cauquenes, 22 June: no reading Cauquenes, 23 June: 14.2 µg/m³, 0.3× usual Curanilahue Curanilahue, 14 June: 84.1 µg/m³, 1.6× usual Curanilahue, 15 June: 52.9 µg/m³, 1.0× usual Curanilahue, 16 June: 24.2 µg/m³, 0.5× usual Curanilahue, 17 June: 91.5 µg/m³, 1.8× usual Curanilahue, 18 June: 169.0 µg/m³, 3.2× usual Curanilahue, 19 June: 183.0 µg/m³, 3.5× usual Curanilahue, 20 June: 81.8 µg/m³, 1.6× usual Curanilahue, 21 June: 49.8 µg/m³, 1.0× usual Curanilahue, 22 June: no reading Curanilahue, 23 June: 38.7 µg/m³, 0.7× usual Los Ángeles Los Ángeles, 14 June: 22.1 µg/m³, 0.6× usual Los Ángeles, 15 June: 34.9 µg/m³, 0.9× usual Los Ángeles, 16 June: 22.3 µg/m³, 0.6× usual Los Ángeles, 17 June: 40.3 µg/m³, 1.0× usual Los Ángeles, 18 June: 96.3 µg/m³, 2.4× usual Los Ángeles, 19 June: 123.2 µg/m³, 3.1× usual Los Ángeles, 20 June: 99.3 µg/m³, 2.5× usual Los Ángeles, 21 June: 56.6 µg/m³, 1.4× usual Los Ángeles, 22 June: no reading Los Ángeles, 23 June: 13.6 µg/m³, 0.3× usual Nacimiento Nacimiento, 14 June: 139.2 µg/m³, 1.9× usual Nacimiento, 15 June: no reading Nacimiento, 16 June: no reading Nacimiento, 17 June: no reading Nacimiento, 18 June: no reading Nacimiento, 19 June: 167.5 µg/m³, 2.3× usual Nacimiento, 20 June: 150.0 µg/m³, 2.1× usual Nacimiento, 21 June: 90.7 µg/m³, 1.2× usual Nacimiento, 22 June: no reading Nacimiento, 23 June: 32.8 µg/m³, 0.5× usual Talca Talca, 14 June: 68.3 µg/m³, 1.6× usual Talca, 15 June: 61.6 µg/m³, 1.4× usual Talca, 16 June: 39.6 µg/m³, 0.9× usual Talca, 17 June: 31.9 µg/m³, 0.7× usual Talca, 18 June: 38.3 µg/m³, 0.9× usual Talca, 19 June: 87.7 µg/m³, 2.0× usual Talca, 20 June: 64.4 µg/m³, 1.5× usual Talca, 21 June: 42.0 µg/m³, 1.0× usual Talca, 22 June: no reading Talca, 23 June: 11.8 µg/m³, 0.3× usual 14 Jun 15 16 17 18 19 20 21 22 23 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. Good 0–50
Moderate 51–100
Sensitive groups 101–150
Unhealthy 151–200
Very unhealthy 201–300
Hazardous 301+
Every city it reached
City Days Highest Usual Above usual
Chillán Ñuble, Chile 3 14 June 40.9 5.1× Puerto Varas Los Lagos Region, Chile 3 20 June 54.8 3.9× Puerto Montt Los Lagos Region, Chile 3 18 June 37.3 3.6× San Carlos Ñuble, Chile 3 14 June 45.4 3.6× Curanilahue Biobio, Chile 2 19 June 52.2 3.5× Los Ángeles Biobio, Chile 3 19 June 39.5 3.1× Temuco Araucania, Chile 4 20 June 52.1 3.0× Lota Biobio, Chile 1 14 June 19.9 2.5× Linares Maule Region, Chile 1 14 June 57.6 2.4× Nacimiento Biobio, Chile 2 19 June 72.6 2.3× La Unión Los Ríos Region, Chile 1 17 June 48.6 2.2× Cauquenes Maule Region, Chile 2 19 June 41.8 2.2× Osorno Los Lagos Region, Chile 2 17 June 64.6 2.0× Talca Maule Region, Chile 1 19 June 43.4 2.0×
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 11 of 30 episodes in Chile since our records began, by cities reached.
South-western Chile, July 2024 24 South-western Chile, July 2026 19 South-western Chile, May 2026 19 South-western Chile, May 2024 19 South-western Chile, May 2024 18 South-western Chile, June and July 2025 17 South-western Chile, July 2024 17 Biobio, Chile, July 2024 15 South-western Chile, August 2026 14 South-western Chile, May 2026 14 South-western Chile, June 2023 14 South-western Chile, July 2023 13 Bars: cities reached; colour: the level of the episode's highest daily reading. All 30 .
Use this page SmogRank, South-western Chile, June 2023: 14 cities with PM2.5 at twice their usual or more, 17 to 20 June 2023, smogrank.com/episodes/2023-06-south-western-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.
