SmogRank / Episodes / Chile
South-western Chile, May 2024
For 5 days, from 24 to 28 May 2024, 18 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: 313.5 µg/m³ on 27 May, about 5.3× its usual 58.9.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 18 in 1 country
Days 5 24 to 28 May 2024
Worst day 28 May 11 cities counted
Furthest above usual 5.3× Osorno
Day by day
Play 28 May 11 cities at twice their usual or more
Chiguayante San Pedro de la Paz Coronel Hualqui Concepción Temuco Nacimiento Hualpén Tomé Talcahuano Villarrica Chillán La Unión Valdivia Puerto Varas Curanilahue Puerto Montt San Carlos Los Ángeles Osorno 21 May 22 23 24 25 26 27 28 29 30 31 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
Valdivia Valdivia, 21 May: 21.9 µg/m³, 0.6× usual Valdivia, 22 May: 45.3 µg/m³, 1.2× usual Valdivia, 23 May: 102.4 µg/m³, 2.7× usual Valdivia, 24 May: 53.0 µg/m³, 1.4× usual Valdivia, 25 May: 69.2 µg/m³, 1.8× usual Valdivia, 26 May: 79.6 µg/m³, 2.1× usual Valdivia, 27 May: 113.2 µg/m³, 3.0× usual Valdivia, 28 May: 103.4 µg/m³, 2.7× usual Valdivia, 29 May: 40.1 µg/m³, 1.1× usual Valdivia, 30 May: 44.5 µg/m³, 1.2× usual Valdivia, 31 May: 34.9 µg/m³, 0.9× usual San Carlos San Carlos, 21 May: 54.9 µg/m³, 1.2× usual San Carlos, 22 May: 44.8 µg/m³, 1.0× usual San Carlos, 23 May: 68.5 µg/m³, 1.5× usual San Carlos, 24 May: 163.0 µg/m³, 3.6× usual San Carlos, 25 May: 180.0 µg/m³, 4.0× usual San Carlos, 26 May: 74.1 µg/m³, 1.6× usual San Carlos, 27 May: 125.0 µg/m³, 2.8× usual San Carlos, 28 May: 146.0 µg/m³, 3.2× usual San Carlos, 29 May: 33.3 µg/m³, 0.7× usual San Carlos, 30 May: 43.8 µg/m³, 1.0× usual San Carlos, 31 May: 58.9 µg/m³, 1.3× usual Curanilahue Curanilahue, 21 May: 55.5 µg/m³, 1.1× usual Curanilahue, 22 May: 71.0 µg/m³, 1.5× usual Curanilahue, 23 May: 82.7 µg/m³, 1.7× usual Curanilahue, 24 May: 102.0 µg/m³, 2.1× usual Curanilahue, 25 May: 107.0 µg/m³, 2.2× usual Curanilahue, 26 May: 162.0 µg/m³, 3.3× usual Curanilahue, 27 May: 95.2 µg/m³, 2.0× usual Curanilahue, 28 May: 105.0 µg/m³, 2.2× usual Curanilahue, 29 May: 31.2 µg/m³, 0.6× usual Curanilahue, 30 May: 32.0 µg/m³, 0.7× usual Curanilahue, 31 May: 50.3 µg/m³, 1.0× usual Chillán Chillán, 21 May: 46.1 µg/m³, 1.0× usual Chillán, 22 May: 45.4 µg/m³, 1.0× usual Chillán, 23 May: 66.2 µg/m³, 1.5× usual Chillán, 24 May: 98.5 µg/m³, 2.2× usual Chillán, 25 May: 111.7 µg/m³, 2.5× usual Chillán, 26 May: 79.4 µg/m³, 1.8× usual Chillán, 27 May: 87.9 µg/m³, 2.0× usual Chillán, 28 May: 123.8 µg/m³, 2.8× usual Chillán, 29 May: 40.5 µg/m³, 0.9× usual Chillán, 30 May: 40.7 µg/m³, 0.9× usual Chillán, 31 May: 46.7 µg/m³, 1.1× usual Talcahuano Talcahuano, 21 May: 30.3 µg/m³, 0.8× usual Talcahuano, 22 May: 44.8 µg/m³, 1.1× usual Talcahuano, 23 May: 58.4 µg/m³, 1.5× usual Talcahuano, 24 May: 83.5 µg/m³, 2.1× usual Talcahuano, 25 May: 66.0 µg/m³, 1.7× usual Talcahuano, 26 May: 52.3 µg/m³, 1.3× usual Talcahuano, 27 May: 83.7 µg/m³, 2.1× usual Talcahuano, 28 May: 97.7 µg/m³, 2.5× usual Talcahuano, 29 May: 27.8 µg/m³, 0.7× usual Talcahuano, 30 May: 32.9 µg/m³, 0.8× usual Talcahuano, 31 May: 78.6 µg/m³, 2.0× usual Concepción Concepción, 21 May: 26.5 µg/m³, 0.9× usual Concepción, 22 May: 40.7 µg/m³, 1.3× usual Concepción, 23 May: 41.9 µg/m³, 1.4× usual Concepción, 24 May: 63.3 µg/m³, 2.1× usual Concepción, 25 May: 56.5 µg/m³, 1.8× usual Concepción, 26 May: 45.0 µg/m³, 1.5× usual Concepción, 27 May: 60.3 µg/m³, 2.0× usual Concepción, 28 May: 62.3 µg/m³, 2.0× usual Concepción, 29 May: 22.2 µg/m³, 0.7× usual Concepción, 30 May: 40.6 µg/m³, 1.3× usual Concepción, 31 May: 43.2 µg/m³, 1.4× usual Nacimiento Nacimiento, 21 May: 59.2 µg/m³, 0.8× usual Nacimiento, 22 May: 128.5 µg/m³, 1.8× usual Nacimiento, 23 May: 79.5 µg/m³, 1.1× usual Nacimiento, 24 May: 119.5 µg/m³, 1.7× usual Nacimiento, 25 May: 145.5 µg/m³, 2.0× usual Nacimiento, 26 May: 134.5 µg/m³, 1.9× usual Nacimiento, 27 May: 157.0 µg/m³, 2.2× usual Nacimiento, 28 May: 132.0 µg/m³, 1.9× usual Nacimiento, 29 May: 48.8 µg/m³, 0.7× usual Nacimiento, 30 May: 35.6 µg/m³, 0.5× usual Nacimiento, 31 May: 59.6 µg/m³, 0.8× usual Puerto Montt Puerto Montt, 21 May: 31.4 µg/m³, 1.0× usual Puerto Montt, 22 May: 53.7 µg/m³, 1.7× usual Puerto Montt, 23 May: 29.0 µg/m³, 0.9× usual Puerto Montt, 24 May: 61.6 µg/m³, 1.9× usual Puerto Montt, 25 May: 128.5 µg/m³, 4.0× usual Puerto Montt, 26 May: 112.5 µg/m³, 3.5× usual Puerto Montt, 27 May: 41.7 µg/m³, 1.3× usual Puerto Montt, 28 May: 34.1 µg/m³, 1.1× usual Puerto Montt, 29 May: 34.1 µg/m³, 1.1× usual Puerto Montt, 30 May: 59.8 µg/m³, 1.8× usual Puerto Montt, 31 May: 59.1 µg/m³, 1.8× usual La Unión La Unión, 21 May: 41.8 µg/m³, 1.0× usual La Unión, 22 May: 58.3 µg/m³, 1.4× usual La Unión, 23 May: 67.1 µg/m³, 1.6× usual La Unión, 24 May: 79.5 µg/m³, 1.8× usual La Unión, 25 May: 112.0 µg/m³, 2.6× usual La Unión, 26 May: 127.0 µg/m³, 2.9× usual La Unión, 27 May: 95.0 µg/m³, 2.2× usual La Unión, 28 May: 72.6 µg/m³, 1.7× usual La Unión, 29 May: 71.3 µg/m³, 1.7× usual La Unión, 30 May: 110.0 µg/m³, 2.6× usual La Unión, 31 May: 61.3 µg/m³, 1.4× usual Los Ángeles Los Ángeles, 21 May: 31.6 µg/m³, 0.9× usual Los Ángeles, 22 May: 43.6 µg/m³, 1.2× usual Los Ángeles, 23 May: 49.3 µg/m³, 1.4× usual Los Ángeles, 24 May: 70.4 µg/m³, 2.0× usual Los Ángeles, 25 May: 97.8 µg/m³, 2.7× usual Los Ángeles, 26 May: 147.6 µg/m³, 4.1× usual Los Ángeles, 27 May: 97.8 µg/m³, 2.7× usual Los Ángeles, 28 May: 129.9 µg/m³, 3.6× usual Los Ángeles, 29 May: 32.2 µg/m³, 0.9× usual Los Ángeles, 30 May: 28.8 µg/m³, 0.8× usual Los Ángeles, 31 May: 34.6 µg/m³, 1.0× usual Osorno Osorno, 21 May: 45.8 µg/m³, 0.8× usual Osorno, 22 May: 100.1 µg/m³, 1.7× usual Osorno, 23 May: 81.3 µg/m³, 1.4× usual Osorno, 24 May: 82.4 µg/m³, 1.4× usual Osorno, 25 May: 93.7 µg/m³, 1.6× usual Osorno, 26 May: 168.5 µg/m³, 2.9× usual Osorno, 27 May: 313.5 µg/m³, 5.3× usual Osorno, 28 May: 151.5 µg/m³, 2.6× usual Osorno, 29 May: 108.5 µg/m³, 1.8× usual Osorno, 30 May: 191.0 µg/m³, 3.2× usual Osorno, 31 May: 89.7 µg/m³, 1.5× usual Puerto Varas Puerto Varas, 21 May: 37.0 µg/m³, 0.8× usual Puerto Varas, 22 May: 94.2 µg/m³, 1.9× usual Puerto Varas, 23 May: 50.6 µg/m³, 1.0× usual Puerto Varas, 24 May: 74.6 µg/m³, 1.5× usual Puerto Varas, 25 May: 77.3 µg/m³, 1.6× usual Puerto Varas, 26 May: 135.0 µg/m³, 2.8× usual Puerto Varas, 27 May: 163.0 µg/m³, 3.3× usual Puerto Varas, 28 May: 34.5 µg/m³, 0.7× usual Puerto Varas, 29 May: 69.0 µg/m³, 1.4× usual Puerto Varas, 30 May: 102.0 µg/m³, 2.1× usual Puerto Varas, 31 May: 89.4 µg/m³, 1.8× usual Temuco Temuco, 21 May: 31.5 µg/m³, 0.6× usual Temuco, 22 May: 73.7 µg/m³, 1.5× usual Temuco, 23 May: 42.8 µg/m³, 0.9× usual Temuco, 24 May: 55.5 µg/m³, 1.1× usual Temuco, 25 May: 92.3 µg/m³, 1.9× usual Temuco, 26 May: 108.0 µg/m³, 2.2× usual Temuco, 27 May: 69.5 µg/m³, 1.4× usual Temuco, 28 May: 85.2 µg/m³, 1.7× usual Temuco, 29 May: 33.0 µg/m³, 0.7× usual Temuco, 30 May: 56.1 µg/m³, 1.1× usual Temuco, 31 May: 47.4 µg/m³, 1.0× usual Hualqui Hualqui, 21 May: no reading Hualqui, 22 May: no reading Hualqui, 23 May: no reading Hualqui, 24 May: no reading Hualqui, 25 May: no reading Hualqui, 26 May: 102.0 µg/m³, 2.1× usual Hualqui, 27 May: 69.0 µg/m³, 1.4× usual Hualqui, 28 May: 83.0 µg/m³, 1.7× usual Hualqui, 29 May: 40.6 µg/m³, 0.9× usual Hualqui, 30 May: 38.2 µg/m³, 0.8× usual Hualqui, 31 May: 45.1 µg/m³, 0.9× usual Hualpén Hualpén, 21 May: 74.1 µg/m³, 1.2× usual Hualpén, 22 May: 84.7 µg/m³, 1.3× usual Hualpén, 23 May: no reading Hualpén, 24 May: 113.0 µg/m³, 1.8× usual Hualpén, 25 May: 88.8 µg/m³, 1.4× usual Hualpén, 26 May: 83.5 µg/m³, 1.3× usual Hualpén, 27 May: 120.0 µg/m³, 1.9× usual Hualpén, 28 May: 148.0 µg/m³, 2.4× usual Hualpén, 29 May: 32.0 µg/m³, 0.5× usual Hualpén, 30 May: 48.7 µg/m³, 0.8× usual Hualpén, 31 May: 92.1 µg/m³, 1.5× usual Villarrica Villarrica, 21 May: 37.4 µg/m³, 0.8× usual Villarrica, 22 May: 82.5 µg/m³, 1.8× usual Villarrica, 23 May: 70.5 µg/m³, 1.6× usual Villarrica, 24 May: 76.4 µg/m³, 1.7× usual Villarrica, 25 May: 17.3 µg/m³, 0.4× usual Villarrica, 26 May: no reading Villarrica, 27 May: 29.2 µg/m³, 0.7× usual Villarrica, 28 May: 115.0 µg/m³, 2.6× usual Villarrica, 29 May: 36.0 µg/m³, 0.8× usual Villarrica, 30 May: 51.3 µg/m³, 1.1× usual Villarrica, 31 May: 46.3 µg/m³, 1.0× usual Coronel Coronel, 21 May: 54.8 µg/m³, 1.2× usual Coronel, 22 May: 74.3 µg/m³, 1.6× usual Coronel, 23 May: 64.7 µg/m³, 1.4× usual Coronel, 24 May: 76.8 µg/m³, 1.7× usual Coronel, 25 May: 77.4 µg/m³, 1.7× usual Coronel, 26 May: 57.2 µg/m³, 1.3× usual Coronel, 27 May: 65.5 µg/m³, 1.4× usual Coronel, 28 May: 95.0 µg/m³, 2.1× usual Coronel, 29 May: 29.5 µg/m³, 0.6× usual Coronel, 30 May: 41.2 µg/m³, 0.9× usual Coronel, 31 May: 47.5 µg/m³, 1.0× usual Tomé Tomé, 21 May: 25.0 µg/m³, 0.8× usual Tomé, 22 May: 40.8 µg/m³, 1.3× usual Tomé, 23 May: 37.7 µg/m³, 1.2× usual Tomé, 24 May: 61.5 µg/m³, 1.9× usual Tomé, 25 May: 55.5 µg/m³, 1.7× usual Tomé, 26 May: 39.0 µg/m³, 1.2× usual Tomé, 27 May: 53.0 µg/m³, 1.6× usual Tomé, 28 May: 77.4 µg/m³, 2.4× usual Tomé, 29 May: 21.8 µg/m³, 0.7× usual Tomé, 30 May: 41.6 µg/m³, 1.3× usual Tomé, 31 May: 32.3 µg/m³, 1.0× usual 21 May 23 25 27 29 31 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
Osorno Los Lagos Region, Chile 3 27 May 58.9 5.3× Los Ángeles Biobio, Chile 4 26 May 35.9 4.1× San Carlos Ñuble, Chile 4 25 May 45.0 4.0× Puerto Montt Los Lagos Region, Chile 2 25 May 32.4 4.0× Puerto Varas Los Lagos Region, Chile 2 27 May 48.8 3.3× Curanilahue Biobio, Chile 4 26 May 48.8 3.3× Valdivia Los Ríos Region, Chile 3 27 May 37.9 3.0× La Unión Los Ríos Region, Chile 3 26 May 43.1 2.9× Chillán Ñuble, Chile 4 28 May 44.0 2.8× Villarrica Araucania, Chile 1 28 May 44.7 2.6× Talcahuano Biobio, Chile 3 28 May 39.3 2.5× Tomé Biobio, Chile 1 28 May 32.3 2.4× Hualpén Biobio, Chile 1 28 May 62.9 2.4× Nacimiento Biobio, Chile 2 27 May 71.2 2.2× Temuco Araucania, Chile 1 26 May 49.5 2.2× Hualqui Biobio, Chile 1 26 May 47.6 2.1× Coronel Biobio, Chile 1 28 May 45.5 2.1× Concepción Biobio, Chile 1 24 May 30.7 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 5 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: 18 cities with PM2.5 at twice their usual or more, 24 to 28 May 2024, smogrank.com/episodes/2024-05-south-western-chile-2 (accessed 3 October 2026).
Copy citation Download top 10 (PNG)
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.
