SmogRank / Episodes / Chile
South-western Chile, 24 to 28 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 Concepción Coronel Hualqui Temuco Nacimiento Tomé Hualpén Talcahuano Villarrica Chillán La Unión Valdivia Curanilahue Puerto Varas 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
San Carlos San Carlos, 21 May: 54.9 µg/m³ San Carlos, 22 May: 44.8 µg/m³ San Carlos, 23 May: 68.5 µg/m³ San Carlos, 24 May: 163.0 µg/m³, 3.6× its usual 45.0 San Carlos, 25 May: 180.0 µg/m³, 4.0× its usual 45.0 San Carlos, 26 May: 74.1 µg/m³ San Carlos, 27 May: 125.0 µg/m³, 2.7× its usual 46.1 San Carlos, 28 May: 146.0 µg/m³, 3.2× its usual 46.1 San Carlos, 29 May: 33.3 µg/m³ San Carlos, 30 May: 43.8 µg/m³ San Carlos, 31 May: 58.9 µg/m³ Curanilahue Curanilahue, 21 May: 55.5 µg/m³ Curanilahue, 22 May: 71.0 µg/m³ Curanilahue, 23 May: 82.7 µg/m³ Curanilahue, 24 May: 102.0 µg/m³, 2.1× its usual 48.8 Curanilahue, 25 May: 107.0 µg/m³, 2.2× its usual 48.8 Curanilahue, 26 May: 162.0 µg/m³, 3.3× its usual 48.8 Curanilahue, 27 May: 95.2 µg/m³ Curanilahue, 28 May: 105.0 µg/m³, 2.1× its usual 50.2 Curanilahue, 29 May: 31.2 µg/m³ Curanilahue, 30 May: 32.0 µg/m³ Curanilahue, 31 May: 50.3 µg/m³ Chillán Chillán, 21 May: 46.1 µg/m³ Chillán, 22 May: 45.4 µg/m³ Chillán, 23 May: 66.2 µg/m³ Chillán, 24 May: 98.5 µg/m³, 2.3× its usual 42.6 Chillán, 25 May: 111.7 µg/m³, 2.6× its usual 42.6 Chillán, 26 May: 79.4 µg/m³ Chillán, 27 May: 87.9 µg/m³, 2.0× its usual 43.6 Chillán, 28 May: 123.8 µg/m³, 2.8× its usual 44.0 Chillán, 29 May: 40.5 µg/m³ Chillán, 30 May: 40.7 µg/m³ Chillán, 31 May: 46.7 µg/m³ Talcahuano Talcahuano, 21 May: 30.3 µg/m³ Talcahuano, 22 May: 44.8 µg/m³ Talcahuano, 23 May: 58.4 µg/m³ Talcahuano, 24 May: 83.5 µg/m³, 2.2× its usual 38.6 Talcahuano, 25 May: 66.0 µg/m³ Talcahuano, 26 May: 52.3 µg/m³ Talcahuano, 27 May: 83.7 µg/m³, 2.1× its usual 39.0 Talcahuano, 28 May: 97.7 µg/m³, 2.5× its usual 39.3 Talcahuano, 29 May: 27.8 µg/m³ Talcahuano, 30 May: 32.9 µg/m³ Talcahuano, 31 May: 78.6 µg/m³ Concepción Concepción, 21 May: 26.5 µg/m³ Concepción, 22 May: 40.7 µg/m³ Concepción, 23 May: 41.9 µg/m³ Concepción, 24 May: 63.3 µg/m³, 2.1× its usual 30.7 Concepción, 25 May: 56.5 µg/m³ Concepción, 26 May: 45.0 µg/m³ Concepción, 27 May: 60.3 µg/m³ Concepción, 28 May: 62.3 µg/m³ Concepción, 29 May: 22.2 µg/m³ Concepción, 30 May: 40.6 µg/m³ Concepción, 31 May: 43.2 µg/m³ Nacimiento Nacimiento, 21 May: 59.2 µg/m³ Nacimiento, 22 May: 128.5 µg/m³ Nacimiento, 23 May: 79.5 µg/m³ Nacimiento, 24 May: 119.5 µg/m³ Nacimiento, 25 May: 145.5 µg/m³, 2.1× its usual 70.8 Nacimiento, 26 May: 134.5 µg/m³ Nacimiento, 27 May: 157.0 µg/m³, 2.2× its usual 71.2 Nacimiento, 28 May: 132.0 µg/m³ Nacimiento, 29 May: 48.8 µg/m³ Nacimiento, 30 May: 35.6 µg/m³ Nacimiento, 31 May: 59.6 µg/m³ Puerto Montt Puerto Montt, 21 May: 31.4 µg/m³ Puerto Montt, 22 May: 53.7 µg/m³ Puerto Montt, 23 May: 29.0 µg/m³ Puerto Montt, 24 May: 61.6 µg/m³ Puerto Montt, 25 May: 128.5 µg/m³, 4.0× its usual 32.4 Puerto Montt, 26 May: 112.5 µg/m³, 3.5× its usual 32.1 Puerto Montt, 27 May: 41.7 µg/m³ Puerto Montt, 28 May: 34.1 µg/m³ Puerto Montt, 29 May: 34.1 µg/m³ Puerto Montt, 30 May: 59.8 µg/m³ Puerto Montt, 31 May: 59.1 µg/m³ La Unión La Unión, 21 May: 41.8 µg/m³ La Unión, 22 May: 58.3 µg/m³ La Unión, 23 May: 67.1 µg/m³ La Unión, 24 May: 79.5 µg/m³ La Unión, 25 May: 112.0 µg/m³, 2.7× its usual 41.9 La Unión, 26 May: 127.0 µg/m³, 2.9× its usual 43.1 La Unión, 27 May: 95.0 µg/m³, 2.2× its usual 43.1 La Unión, 28 May: 72.6 µg/m³ La Unión, 29 May: 71.3 µg/m³ La Unión, 30 May: 110.0 µg/m³ La Unión, 31 May: 61.3 µg/m³ Los Ángeles Los Ángeles, 21 May: 31.6 µg/m³ Los Ángeles, 22 May: 43.6 µg/m³ Los Ángeles, 23 May: 49.3 µg/m³ Los Ángeles, 24 May: 70.4 µg/m³ Los Ángeles, 25 May: 97.8 µg/m³, 2.7× its usual 35.9 Los Ángeles, 26 May: 147.6 µg/m³, 4.1× its usual 35.9 Los Ángeles, 27 May: 97.8 µg/m³, 2.7× its usual 35.9 Los Ángeles, 28 May: 129.9 µg/m³, 3.5× its usual 36.6 Los Ángeles, 29 May: 32.2 µg/m³ Los Ángeles, 30 May: 28.8 µg/m³ Los Ángeles, 31 May: 34.6 µg/m³ Osorno Osorno, 21 May: 45.8 µg/m³ Osorno, 22 May: 100.1 µg/m³ Osorno, 23 May: 81.3 µg/m³ Osorno, 24 May: 82.4 µg/m³ Osorno, 25 May: 93.7 µg/m³ Osorno, 26 May: 168.5 µg/m³, 2.9× its usual 58.9 Osorno, 27 May: 313.5 µg/m³, 5.3× its usual 58.9 Osorno, 28 May: 151.5 µg/m³, 2.5× its usual 59.9 Osorno, 29 May: 108.5 µg/m³ Osorno, 30 May: 191.0 µg/m³ Osorno, 31 May: 89.7 µg/m³ Puerto Varas Puerto Varas, 21 May: 37.0 µg/m³ Puerto Varas, 22 May: 94.2 µg/m³ Puerto Varas, 23 May: 50.6 µg/m³ Puerto Varas, 24 May: 74.6 µg/m³ Puerto Varas, 25 May: 77.3 µg/m³ Puerto Varas, 26 May: 135.0 µg/m³, 2.8× its usual 48.4 Puerto Varas, 27 May: 163.0 µg/m³, 3.3× its usual 48.8 Puerto Varas, 28 May: 34.5 µg/m³ Puerto Varas, 29 May: 69.0 µg/m³ Puerto Varas, 30 May: 102.0 µg/m³ Puerto Varas, 31 May: 89.4 µg/m³ Temuco Temuco, 21 May: 31.5 µg/m³ Temuco, 22 May: 73.7 µg/m³ Temuco, 23 May: 42.8 µg/m³ Temuco, 24 May: 55.5 µg/m³ Temuco, 25 May: 92.3 µg/m³ Temuco, 26 May: 108.0 µg/m³, 2.2× its usual 49.5 Temuco, 27 May: 69.5 µg/m³ Temuco, 28 May: 85.2 µg/m³ Temuco, 29 May: 33.0 µg/m³ Temuco, 30 May: 56.1 µg/m³ Temuco, 31 May: 47.4 µg/m³ 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× its usual 47.6 Hualqui, 27 May: 69.0 µg/m³ Hualqui, 28 May: 83.0 µg/m³ Hualqui, 29 May: 40.6 µg/m³ Hualqui, 30 May: 38.2 µg/m³ Hualqui, 31 May: 45.1 µg/m³ Valdivia Valdivia, 21 May: 21.9 µg/m³ Valdivia, 22 May: 45.3 µg/m³ Valdivia, 23 May: 102.4 µg/m³ Valdivia, 24 May: 53.0 µg/m³ Valdivia, 25 May: 69.2 µg/m³ Valdivia, 26 May: 79.6 µg/m³, 2.1× its usual 38.2 Valdivia, 27 May: 113.2 µg/m³, 3.0× its usual 37.9 Valdivia, 28 May: 103.4 µg/m³, 2.7× its usual 38.6 Valdivia, 29 May: 40.1 µg/m³ Valdivia, 30 May: 44.5 µg/m³ Valdivia, 31 May: 34.9 µg/m³ Hualpén Hualpén, 21 May: 74.1 µg/m³ Hualpén, 22 May: 84.7 µg/m³ Hualpén, 23 May: no reading Hualpén, 24 May: 113.0 µg/m³ Hualpén, 25 May: 88.8 µg/m³ Hualpén, 26 May: 83.5 µg/m³ Hualpén, 27 May: 120.0 µg/m³ Hualpén, 28 May: 148.0 µg/m³, 2.4× its usual 62.9 Hualpén, 29 May: 32.0 µg/m³ Hualpén, 30 May: 48.7 µg/m³ Hualpén, 31 May: 92.1 µg/m³ Villarrica Villarrica, 21 May: 37.4 µg/m³ Villarrica, 22 May: 82.5 µg/m³ Villarrica, 23 May: 70.5 µg/m³ Villarrica, 24 May: 76.4 µg/m³ Villarrica, 25 May: 17.3 µg/m³ Villarrica, 26 May: no reading Villarrica, 27 May: 29.2 µg/m³ Villarrica, 28 May: 115.0 µg/m³, 2.6× its usual 44.7 Villarrica, 29 May: 36.0 µg/m³ Villarrica, 30 May: 51.3 µg/m³ Villarrica, 31 May: 46.3 µg/m³ Coronel Coronel, 21 May: 54.8 µg/m³ Coronel, 22 May: 74.3 µg/m³ Coronel, 23 May: 64.7 µg/m³ Coronel, 24 May: 76.8 µg/m³ Coronel, 25 May: 77.4 µg/m³ Coronel, 26 May: 57.2 µg/m³ Coronel, 27 May: 65.5 µg/m³ Coronel, 28 May: 95.0 µg/m³, 2.1× its usual 45.5 Coronel, 29 May: 29.5 µg/m³ Coronel, 30 May: 41.2 µg/m³ Coronel, 31 May: 47.5 µg/m³ Tomé Tomé, 21 May: 25.0 µg/m³ Tomé, 22 May: 40.8 µg/m³ Tomé, 23 May: 37.7 µg/m³ Tomé, 24 May: 61.5 µg/m³ Tomé, 25 May: 55.5 µg/m³ Tomé, 26 May: 39.0 µg/m³ Tomé, 27 May: 53.0 µg/m³ Tomé, 28 May: 77.4 µg/m³, 2.4× its usual 32.3 Tomé, 29 May: 21.8 µg/m³ Tomé, 30 May: 41.6 µg/m³ Tomé, 31 May: 32.3 µg/m³ 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× Hualpén Biobio, Chile 1 28 May 62.9 2.4× Tomé Biobio, Chile 1 28 May 32.3 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, 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 5 of 30 episodes in Chile since our records began, by cities reached.
Southern Chile, 11 to 14 July 2024 24 Southern Chile, July 2026 19 Southern Chile, 18 to 22 May 2026 19 South-western Chile, 14 to 19 May 2024 19 South-western Chile, 24 to 28 May 2024 18 Southern Chile, 29 June to 4 July 2025 17 Southern Chile, 30 to 31 July 2024 17 South-western Chile, July 2024 15 Southern Chile, August 2026 14 Southern Chile, 25 to 27 May 2026 14 South-western Chile, 17 to 20 June 2023 14 Southern 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, 24 to 28 May 2024: 18 cities with PM2.5 at twice their usual or more, 24 to 28 May 2024, smogrank.com/episodes/2024-05-24-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.
