SmogRank / Episodes / Chile
South-western Chile, May 2024
For 6 days, from 14 to 19 May 2024, 19 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: 275.0 µg/m³ on 16 May, about 4.9× its usual 55.9.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 19 in 1 country
Days 6 14 to 19 May 2024
Worst day 18 May 18 cities counted
Furthest above usual 5.1× Puerto Varas
Day by day
Play 18 May 18 cities at twice their usual or more
Concepción Tomé Curicó San Pedro de la Paz Talca Cauquenes Chiguayante Nacimiento Valdivia Villarrica Curanilahue Coronel Temuco Talcahuano Hualpén Chillán Los Ángeles La Unión San Carlos Puerto Montt Osorno Puerto Varas 11 May 12 13 14 15 16 17 18 19 20 21 22 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, 11 May: 118.3 µg/m³, 2.9× usual Chillán, 12 May: 104.2 µg/m³, 2.6× usual Chillán, 13 May: 44.0 µg/m³, 1.1× usual Chillán, 14 May: 102.6 µg/m³, 2.5× usual Chillán, 15 May: 87.8 µg/m³, 2.2× usual Chillán, 16 May: 50.7 µg/m³, 1.2× usual Chillán, 17 May: 80.2 µg/m³, 2.0× usual Chillán, 18 May: 129.6 µg/m³, 3.2× usual Chillán, 19 May: 134.4 µg/m³, 3.3× usual Chillán, 20 May: 62.3 µg/m³, 1.5× usual Chillán, 21 May: 46.1 µg/m³, 1.1× usual Chillán, 22 May: 45.4 µg/m³, 1.1× usual Hualpén Hualpén, 11 May: 110.0 µg/m³, 2.1× usual Hualpén, 12 May: 102.0 µg/m³, 1.9× usual Hualpén, 13 May: 62.6 µg/m³, 1.2× usual Hualpén, 14 May: 93.3 µg/m³, 1.7× usual Hualpén, 15 May: 129.0 µg/m³, 2.4× usual Hualpén, 16 May: 50.2 µg/m³, 0.9× usual Hualpén, 17 May: 104.0 µg/m³, 1.9× usual Hualpén, 18 May: 135.0 µg/m³, 2.5× usual Hualpén, 19 May: 167.0 µg/m³, 3.1× usual Hualpén, 20 May: 63.5 µg/m³, 1.2× usual Hualpén, 21 May: 74.1 µg/m³, 1.4× usual Hualpén, 22 May: 84.7 µg/m³, 1.6× usual Villarrica Villarrica, 11 May: 108.0 µg/m³, 2.4× usual Villarrica, 12 May: 53.5 µg/m³, 1.2× usual Villarrica, 13 May: 41.3 µg/m³, 0.9× usual Villarrica, 14 May: 73.4 µg/m³, 1.7× usual Villarrica, 15 May: 92.9 µg/m³, 2.1× usual Villarrica, 16 May: 76.6 µg/m³, 1.7× usual Villarrica, 17 May: 107.0 µg/m³, 2.4× usual Villarrica, 18 May: 115.0 µg/m³, 2.6× usual Villarrica, 19 May: 96.3 µg/m³, 2.2× usual Villarrica, 20 May: 31.8 µg/m³, 0.7× usual Villarrica, 21 May: 37.4 µg/m³, 0.8× usual Villarrica, 22 May: 82.5 µg/m³, 1.9× usual San Carlos San Carlos, 11 May: 102.0 µg/m³, 2.3× usual San Carlos, 12 May: 73.1 µg/m³, 1.7× usual San Carlos, 13 May: 58.2 µg/m³, 1.3× usual San Carlos, 14 May: 113.0 µg/m³, 2.6× usual San Carlos, 15 May: 56.2 µg/m³, 1.3× usual San Carlos, 16 May: 50.6 µg/m³, 1.1× usual San Carlos, 17 May: 90.4 µg/m³, 2.0× usual San Carlos, 18 May: 179.0 µg/m³, 4.0× usual San Carlos, 19 May: 138.0 µg/m³, 3.1× usual San Carlos, 20 May: 65.0 µg/m³, 1.5× usual San Carlos, 21 May: 54.9 µg/m³, 1.2× usual San Carlos, 22 May: 44.8 µg/m³, 1.0× usual Talcahuano Talcahuano, 11 May: 95.3 µg/m³, 2.7× usual Talcahuano, 12 May: 88.7 µg/m³, 2.5× usual Talcahuano, 13 May: 49.7 µg/m³, 1.4× usual Talcahuano, 14 May: 51.7 µg/m³, 1.5× usual Talcahuano, 15 May: 104.2 µg/m³, 2.9× usual Talcahuano, 16 May: 40.4 µg/m³, 1.1× usual Talcahuano, 17 May: 79.6 µg/m³, 2.2× usual Talcahuano, 18 May: 108.0 µg/m³, 3.0× usual Talcahuano, 19 May: 108.3 µg/m³, 3.0× usual Talcahuano, 20 May: 30.6 µg/m³, 0.9× usual Talcahuano, 21 May: 30.3 µg/m³, 0.9× usual Talcahuano, 22 May: 44.8 µg/m³, 1.3× usual Los Ángeles Los Ángeles, 11 May: 91.9 µg/m³, 2.7× usual Los Ángeles, 12 May: 64.1 µg/m³, 1.9× usual Los Ángeles, 13 May: 27.1 µg/m³, 0.8× usual Los Ángeles, 14 May: 44.2 µg/m³, 1.3× usual Los Ángeles, 15 May: 119.9 µg/m³, 3.5× usual Los Ángeles, 16 May: 65.8 µg/m³, 1.9× usual Los Ángeles, 17 May: 68.0 µg/m³, 2.0× usual Los Ángeles, 18 May: 95.9 µg/m³, 2.8× usual Los Ángeles, 19 May: 93.8 µg/m³, 2.7× usual Los Ángeles, 20 May: 56.5 µg/m³, 1.6× usual Los Ángeles, 21 May: 31.6 µg/m³, 0.9× usual Los Ángeles, 22 May: 43.6 µg/m³, 1.3× usual Nacimiento Nacimiento, 11 May: 100.3 µg/m³, 1.5× usual Nacimiento, 12 May: 139.0 µg/m³, 2.1× usual Nacimiento, 13 May: 82.2 µg/m³, 1.2× usual Nacimiento, 14 May: 126.4 µg/m³, 1.9× usual Nacimiento, 15 May: 120.0 µg/m³, 1.8× usual Nacimiento, 16 May: 140.5 µg/m³, 2.1× usual Nacimiento, 17 May: 175.8 µg/m³, 2.6× usual Nacimiento, 18 May: 150.8 µg/m³, 2.3× usual Nacimiento, 19 May: 142.0 µg/m³, 2.1× usual Nacimiento, 20 May: 84.7 µg/m³, 1.3× usual Nacimiento, 21 May: 59.2 µg/m³, 0.9× usual Nacimiento, 22 May: 128.5 µg/m³, 1.9× usual Puerto Montt Puerto Montt, 11 May: 44.5 µg/m³, 1.4× usual Puerto Montt, 12 May: 68.5 µg/m³, 2.1× usual Puerto Montt, 13 May: 119.6 µg/m³, 3.7× usual Puerto Montt, 14 May: 87.0 µg/m³, 2.7× usual Puerto Montt, 15 May: 62.4 µg/m³, 2.0× usual Puerto Montt, 16 May: 95.8 µg/m³, 3.0× usual Puerto Montt, 17 May: 114.5 µg/m³, 3.6× usual Puerto Montt, 18 May: 137.5 µg/m³, 4.3× usual Puerto Montt, 19 May: 44.3 µg/m³, 1.4× usual Puerto Montt, 20 May: 27.1 µg/m³, 0.8× usual Puerto Montt, 21 May: 31.4 µg/m³, 1.0× usual Puerto Montt, 22 May: 53.7 µg/m³, 1.7× usual Puerto Varas Puerto Varas, 11 May: 56.9 µg/m³, 1.3× usual Puerto Varas, 12 May: 62.0 µg/m³, 1.4× usual Puerto Varas, 13 May: 87.3 µg/m³, 2.0× usual Puerto Varas, 14 May: 74.4 µg/m³, 1.7× usual Puerto Varas, 15 May: 52.2 µg/m³, 1.2× usual Puerto Varas, 16 May: 182.0 µg/m³, 4.2× usual Puerto Varas, 17 May: 222.0 µg/m³, 5.1× usual Puerto Varas, 18 May: 150.0 µg/m³, 3.5× usual Puerto Varas, 19 May: 89.3 µg/m³, 2.1× usual Puerto Varas, 20 May: 27.3 µg/m³, 0.6× usual Puerto Varas, 21 May: 37.0 µg/m³, 0.9× usual Puerto Varas, 22 May: 94.2 µg/m³, 2.2× usual Temuco Temuco, 11 May: 51.1 µg/m³, 1.2× usual Temuco, 12 May: 64.6 µg/m³, 1.5× usual Temuco, 13 May: 80.8 µg/m³, 1.8× usual Temuco, 14 May: 119.0 µg/m³, 2.7× usual Temuco, 15 May: 63.6 µg/m³, 1.5× usual Temuco, 16 May: 58.5 µg/m³, 1.3× usual Temuco, 17 May: 126.0 µg/m³, 2.9× usual Temuco, 18 May: 105.0 µg/m³, 2.4× usual Temuco, 19 May: 91.9 µg/m³, 2.1× usual Temuco, 20 May: 50.0 µg/m³, 1.1× usual Temuco, 21 May: 31.5 µg/m³, 0.7× usual Temuco, 22 May: 73.7 µg/m³, 1.7× usual Coronel Coronel, 11 May: 50.1 µg/m³, 1.1× usual Coronel, 12 May: 77.1 µg/m³, 1.8× usual Coronel, 13 May: 77.6 µg/m³, 1.8× usual Coronel, 14 May: 105.7 µg/m³, 2.4× usual Coronel, 15 May: 92.4 µg/m³, 2.1× usual Coronel, 16 May: 41.3 µg/m³, 0.9× usual Coronel, 17 May: 111.9 µg/m³, 2.6× usual Coronel, 18 May: 124.7 µg/m³, 2.9× usual Coronel, 19 May: 78.5 µg/m³, 1.8× usual Coronel, 20 May: 37.5 µg/m³, 0.9× usual Coronel, 21 May: 54.8 µg/m³, 1.3× usual Coronel, 22 May: 74.3 µg/m³, 1.7× usual La Unión La Unión, 11 May: 61.3 µg/m³, 1.5× usual La Unión, 12 May: 46.8 µg/m³, 1.2× usual La Unión, 13 May: 59.8 µg/m³, 1.5× usual La Unión, 14 May: 103.0 µg/m³, 2.6× usual La Unión, 15 May: 72.7 µg/m³, 1.8× usual La Unión, 16 May: 116.0 µg/m³, 2.9× usual La Unión, 17 May: 140.0 µg/m³, 3.5× usual La Unión, 18 May: 101.0 µg/m³, 2.5× usual La Unión, 19 May: 49.2 µg/m³, 1.2× usual La Unión, 20 May: 39.3 µg/m³, 1.0× usual La Unión, 21 May: 41.8 µg/m³, 1.0× usual La Unión, 22 May: 58.3 µg/m³, 1.5× usual Curanilahue Curanilahue, 11 May: 72.2 µg/m³, 1.6× usual Curanilahue, 12 May: 76.8 µg/m³, 1.7× usual Curanilahue, 13 May: 42.0 µg/m³, 0.9× usual Curanilahue, 14 May: 101.0 µg/m³, 2.2× usual Curanilahue, 15 May: 121.0 µg/m³, 2.6× usual Curanilahue, 16 May: 62.0 µg/m³, 1.3× usual Curanilahue, 17 May: 74.9 µg/m³, 1.6× usual Curanilahue, 18 May: 121.0 µg/m³, 2.6× usual Curanilahue, 19 May: 110.0 µg/m³, 2.4× usual Curanilahue, 20 May: 55.2 µg/m³, 1.2× usual Curanilahue, 21 May: 55.5 µg/m³, 1.2× usual Curanilahue, 22 May: 71.0 µg/m³, 1.5× usual Osorno Osorno, 11 May: 65.8 µg/m³, 1.2× usual Osorno, 12 May: 77.4 µg/m³, 1.4× usual Osorno, 13 May: 94.3 µg/m³, 1.7× usual Osorno, 14 May: 85.3 µg/m³, 1.5× usual Osorno, 15 May: 128.0 µg/m³, 2.3× usual Osorno, 16 May: 275.0 µg/m³, 4.9× usual Osorno, 17 May: 192.5 µg/m³, 3.4× usual Osorno, 18 May: 165.0 µg/m³, 3.0× usual Osorno, 19 May: 75.3 µg/m³, 1.3× usual Osorno, 20 May: 37.8 µg/m³, 0.7× usual Osorno, 21 May: 45.8 µg/m³, 0.8× usual Osorno, 22 May: 100.1 µg/m³, 1.8× usual Chiguayante Chiguayante, 11 May: 45.7 µg/m³, 1.5× usual Chiguayante, 12 May: 45.2 µg/m³, 1.5× usual Chiguayante, 13 May: 44.2 µg/m³, 1.5× usual Chiguayante, 14 May: 45.4 µg/m³, 1.5× usual Chiguayante, 15 May: 70.0 µg/m³, 2.3× usual Chiguayante, 16 May: 75.3 µg/m³, 2.5× usual Chiguayante, 17 May: 54.2 µg/m³, 1.8× usual Chiguayante, 18 May: 61.2 µg/m³, 2.0× usual Chiguayante, 19 May: 59.4 µg/m³, 2.0× usual Chiguayante, 20 May: 27.9 µg/m³, 0.9× usual Chiguayante, 21 May: 46.2 µg/m³, 1.5× usual Chiguayante, 22 May: 42.1 µg/m³, 1.4× usual Valdivia Valdivia, 11 May: 43.0 µg/m³, 1.2× usual Valdivia, 12 May: 51.6 µg/m³, 1.4× usual Valdivia, 13 May: 66.4 µg/m³, 1.8× usual Valdivia, 14 May: 71.2 µg/m³, 1.9× usual Valdivia, 15 May: 44.8 µg/m³, 1.2× usual Valdivia, 16 May: 97.4 µg/m³, 2.6× usual Valdivia, 17 May: 76.0 µg/m³, 2.0× usual Valdivia, 18 May: 33.7 µg/m³, 0.9× usual Valdivia, 19 May: 37.5 µg/m³, 1.0× usual Valdivia, 20 May: 29.1 µg/m³, 0.8× usual Valdivia, 21 May: 21.9 µg/m³, 0.6× usual Valdivia, 22 May: 45.3 µg/m³, 1.2× usual Talca Talca, 11 May: 52.4 µg/m³, 1.3× usual Talca, 12 May: 58.8 µg/m³, 1.4× usual Talca, 13 May: 40.5 µg/m³, 1.0× usual Talca, 14 May: 61.2 µg/m³, 1.5× usual Talca, 15 May: 68.3 µg/m³, 1.7× usual Talca, 16 May: 45.4 µg/m³, 1.1× usual Talca, 17 May: 86.0 µg/m³, 2.1× usual Talca, 18 May: 91.9 µg/m³, 2.2× usual Talca, 19 May: 93.9 µg/m³, 2.3× usual Talca, 20 May: 67.5 µg/m³, 1.6× usual Talca, 21 May: 32.1 µg/m³, 0.8× usual Talca, 22 May: 40.6 µg/m³, 1.0× usual Cauquenes Cauquenes, 11 May: 39.0 µg/m³, 1.1× usual Cauquenes, 12 May: 37.7 µg/m³, 1.1× usual Cauquenes, 13 May: 38.7 µg/m³, 1.1× usual Cauquenes, 14 May: 49.0 µg/m³, 1.4× usual Cauquenes, 15 May: 60.2 µg/m³, 1.7× usual Cauquenes, 16 May: 55.8 µg/m³, 1.6× usual Cauquenes, 17 May: 63.5 µg/m³, 1.8× usual Cauquenes, 18 May: 82.7 µg/m³, 2.3× usual Cauquenes, 19 May: 90.3 µg/m³, 2.5× usual Cauquenes, 20 May: 57.9 µg/m³, 1.6× usual Cauquenes, 21 May: 47.0 µg/m³, 1.3× usual Cauquenes, 22 May: 44.4 µg/m³, 1.3× usual San Pedro de la Paz San Pedro de la Paz, 11 May: 38.0 µg/m³, 1.4× usual San Pedro de la Paz, 12 May: 38.5 µg/m³, 1.4× usual San Pedro de la Paz, 13 May: 30.3 µg/m³, 1.1× usual San Pedro de la Paz, 14 May: 37.6 µg/m³, 1.4× usual San Pedro de la Paz, 15 May: 46.3 µg/m³, 1.7× usual San Pedro de la Paz, 16 May: 27.1 µg/m³, 1.0× usual San Pedro de la Paz, 17 May: 41.3 µg/m³, 1.5× usual San Pedro de la Paz, 18 May: 56.0 µg/m³, 2.1× usual San Pedro de la Paz, 19 May: 55.5 µg/m³, 2.0× usual San Pedro de la Paz, 20 May: 22.8 µg/m³, 0.8× usual San Pedro de la Paz, 21 May: 25.5 µg/m³, 0.9× usual San Pedro de la Paz, 22 May: 29.6 µg/m³, 1.1× usual 11 May 13 15 17 19 21 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
Puerto Varas Los Lagos Region, Chile 4 17 May 43.3 5.1× Osorno Los Lagos Region, Chile 4 16 May 55.9 4.9× Puerto Montt Los Lagos Region, Chile 4 18 May 31.9 4.3× San Carlos Ñuble, Chile 4 18 May 44.3 4.0× La Unión Los Ríos Region, Chile 4 17 May 39.9 3.5× Los Ángeles Biobio, Chile 3 15 May 34.6 3.5× Chillán Ñuble, Chile 4 19 May 40.7 3.3× Hualpén Biobio, Chile 3 19 May 53.4 3.1× Talcahuano Biobio, Chile 4 19 May 35.6 3.0× Temuco Araucania, Chile 4 17 May 43.7 2.9× Coronel Biobio, Chile 4 18 May 43.7 2.9× Nacimiento Biobio, Chile 4 17 May 66.9 2.6× Valdivia Los Ríos Region, Chile 2 16 May 37.3 2.6× Curanilahue Biobio, Chile 4 15 May 46.5 2.6× Villarrica Araucania, Chile 4 18 May 44.4 2.6× Cauquenes Maule Region, Chile 2 19 May 35.5 2.5× Chiguayante Biobio, Chile 3 16 May 29.9 2.5× Talca Maule Region, Chile 3 19 May 41.3 2.3× San Pedro de la Paz Biobio, Chile 2 18 May 27.3 2.1×
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 4 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, May 2024: 19 cities with PM2.5 at twice their usual or more, 14 to 19 May 2024, smogrank.com/episodes/2024-05-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.
