SmogRank / Episodes / Chile
South-western Chile, July 2024
For 4 days, from 11 to 14 July 2024, 24 cities in Chile had PM2.5 at least twice their usual for the time of year. The worst reading was Cauquenes, Maule Region, Chile: 255.0 µg/m³ on 11 July, about 6.5× its usual 39.5.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 24 in 1 country
Days 4 11 to 14 July 2024
Worst day 14 July 17 cities counted
Furthest above usual 6.5× Cauquenes
Day by day
Play 14 July 17 cities at twice their usual or more
San Carlos Hualqui Tomé Concepción San Pedro de la Paz Coronel Talca Puente Alto Concón Puerto Varas Osorno Quintero Quillota Santiago Villarrica Quilpué Lota Talagante Viña del Mar Chiguayante Rengo Valdivia Nacimiento La Unión Hualpén Curanilahue Temuco Curicó Los Ángeles Chillán Rancagua Talcahuano Puerto Montt Cauquenes 8 Jul 9 10 11 12 13 14 15 16 17 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
Hualpén Hualpén, 8 July: 98.6 µg/m³, 1.6× usual Hualpén, 9 July: 152.0 µg/m³, 2.4× usual Hualpén, 10 July: no reading Hualpén, 11 July: 171.0 µg/m³, 2.7× usual Hualpén, 12 July: 133.0 µg/m³, 2.1× usual Hualpén, 13 July: 69.0 µg/m³, 1.1× usual Hualpén, 14 July: 105.0 µg/m³, 1.7× usual Hualpén, 15 July: 80.2 µg/m³, 1.3× usual Hualpén, 16 July: 111.0 µg/m³, 1.8× usual Hualpén, 17 July: 48.7 µg/m³, 0.8× usual Rancagua Rancagua, 8 July: 72.7 µg/m³, 1.4× usual Rancagua, 9 July: 106.7 µg/m³, 2.0× usual Rancagua, 10 July: 78.0 µg/m³, 1.5× usual Rancagua, 11 July: 86.8 µg/m³, 1.7× usual Rancagua, 12 July: 127.0 µg/m³, 2.4× usual Rancagua, 13 July: 127.0 µg/m³, 2.4× usual Rancagua, 14 July: 204.0 µg/m³, 3.9× usual Rancagua, 15 July: 116.0 µg/m³, 2.2× usual Rancagua, 16 July: 92.8 µg/m³, 1.8× usual Rancagua, 17 July: 86.0 µg/m³, 1.6× usual Talcahuano Talcahuano, 8 July: 52.5 µg/m³, 1.4× usual Talcahuano, 9 July: 101.1 µg/m³, 2.6× usual Talcahuano, 10 July: 161.5 µg/m³, 4.2× usual Talcahuano, 11 July: 151.5 µg/m³, 4.0× usual Talcahuano, 12 July: 103.0 µg/m³, 2.7× usual Talcahuano, 13 July: 46.6 µg/m³, 1.2× usual Talcahuano, 14 July: 66.3 µg/m³, 1.7× usual Talcahuano, 15 July: 60.6 µg/m³, 1.6× usual Talcahuano, 16 July: 88.0 µg/m³, 2.3× usual Talcahuano, 17 July: 36.1 µg/m³, 0.9× usual Chiguayante Chiguayante, 8 July: 50.7 µg/m³, 1.7× usual Chiguayante, 9 July: 98.5 µg/m³, 3.4× usual Chiguayante, 10 July: 71.0 µg/m³, 2.4× usual Chiguayante, 11 July: 64.1 µg/m³, 2.2× usual Chiguayante, 12 July: 54.1 µg/m³, 1.9× usual Chiguayante, 13 July: 64.5 µg/m³, 2.2× usual Chiguayante, 14 July: 57.4 µg/m³, 2.0× usual Chiguayante, 15 July: 37.2 µg/m³, 1.3× usual Chiguayante, 16 July: 47.9 µg/m³, 1.6× usual Chiguayante, 17 July: 42.5 µg/m³, 1.5× usual Cauquenes Cauquenes, 8 July: 50.5 µg/m³, 1.3× usual Cauquenes, 9 July: 56.1 µg/m³, 1.4× usual Cauquenes, 10 July: 120.0 µg/m³, 3.0× usual Cauquenes, 11 July: 255.0 µg/m³, 6.5× usual Cauquenes, 12 July: 50.5 µg/m³, 1.3× usual Cauquenes, 13 July: 77.6 µg/m³, 2.0× usual Cauquenes, 14 July: 54.4 µg/m³, 1.4× usual Cauquenes, 15 July: 40.8 µg/m³, 1.0× usual Cauquenes, 16 July: 46.9 µg/m³, 1.2× usual Cauquenes, 17 July: no reading Nacimiento Nacimiento, 8 July: 74.2 µg/m³, 1.1× usual Nacimiento, 9 July: 61.9 µg/m³, 0.9× usual Nacimiento, 10 July: 114.1 µg/m³, 1.6× usual Nacimiento, 11 July: 70.9 µg/m³, 1.0× usual Nacimiento, 12 July: 160.7 µg/m³, 2.3× usual Nacimiento, 13 July: 130.0 µg/m³, 1.9× usual Nacimiento, 14 July: 78.5 µg/m³, 1.1× usual Nacimiento, 15 July: no reading Nacimiento, 16 July: 93.9 µg/m³, 1.3× usual Nacimiento, 17 July: 110.9 µg/m³, 1.6× usual Curanilahue Curanilahue, 8 July: 29.5 µg/m³, 0.6× usual Curanilahue, 9 July: no reading Curanilahue, 10 July: 51.1 µg/m³, 1.1× usual Curanilahue, 11 July: 54.8 µg/m³, 1.2× usual Curanilahue, 12 July: 129.0 µg/m³, 2.8× usual Curanilahue, 13 July: 86.5 µg/m³, 1.8× usual Curanilahue, 14 July: 94.3 µg/m³, 2.0× usual Curanilahue, 15 July: 56.3 µg/m³, 1.2× usual Curanilahue, 16 July: 98.2 µg/m³, 2.1× usual Curanilahue, 17 July: 54.3 µg/m³, 1.2× usual Temuco Temuco, 8 July: 94.7 µg/m³, 2.1× usual Temuco, 9 July: 70.0 µg/m³, 1.5× usual Temuco, 10 July: 91.3 µg/m³, 2.0× usual Temuco, 11 July: 89.5 µg/m³, 2.0× usual Temuco, 12 July: 127.0 µg/m³, 2.8× usual Temuco, 13 July: 92.4 µg/m³, 2.0× usual Temuco, 14 July: 120.0 µg/m³, 2.7× usual Temuco, 15 July: 95.5 µg/m³, 2.1× usual Temuco, 16 July: 69.2 µg/m³, 1.5× usual Temuco, 17 July: 46.7 µg/m³, 1.0× usual Lota Lota, 8 July: 24.7 µg/m³, 1.3× usual Lota, 9 July: 27.1 µg/m³, 1.4× usual Lota, 10 July: 36.5 µg/m³, 1.9× usual Lota, 11 July: 31.9 µg/m³, 1.7× usual Lota, 12 July: 40.5 µg/m³, 2.1× usual Lota, 13 July: 31.5 µg/m³, 1.7× usual Lota, 14 July: 21.5 µg/m³, 1.1× usual Lota, 15 July: 28.0 µg/m³, 1.5× usual Lota, 16 July: 39.3 µg/m³, 2.1× usual Lota, 17 July: 32.2 µg/m³, 1.7× usual Curicó Curicó, 8 July: 99.0 µg/m³, 2.0× usual Curicó, 9 July: 70.1 µg/m³, 1.4× usual Curicó, 10 July: 77.3 µg/m³, 1.6× usual Curicó, 11 July: 53.4 µg/m³, 1.1× usual Curicó, 12 July: no reading Curicó, 13 July: 150.0 µg/m³, 3.0× usual Curicó, 14 July: 125.0 µg/m³, 2.5× usual Curicó, 15 July: 43.1 µg/m³, 0.9× usual Curicó, 16 July: 53.0 µg/m³, 1.1× usual Curicó, 17 July: 93.3 µg/m³, 1.9× usual Chillán Chillán, 8 July: 38.1 µg/m³, 1.0× usual Chillán, 9 July: 39.3 µg/m³, 1.0× usual Chillán, 10 July: 40.7 µg/m³, 1.0× usual Chillán, 11 July: 53.8 µg/m³, 1.3× usual Chillán, 12 July: 78.4 µg/m³, 2.0× usual Chillán, 13 July: 129.7 µg/m³, 3.2× usual Chillán, 14 July: 80.0 µg/m³, 2.0× usual Chillán, 15 July: 45.5 µg/m³, 1.1× usual Chillán, 16 July: 57.5 µg/m³, 1.4× usual Chillán, 17 July: 97.1 µg/m³, 2.4× usual Los Ángeles Los Ángeles, 8 July: 25.7 µg/m³, 0.7× usual Los Ángeles, 9 July: 29.0 µg/m³, 0.8× usual Los Ángeles, 10 July: 63.9 µg/m³, 1.8× usual Los Ángeles, 11 July: 40.8 µg/m³, 1.1× usual Los Ángeles, 12 July: 46.5 µg/m³, 1.3× usual Los Ángeles, 13 July: 95.4 µg/m³, 2.7× usual Los Ángeles, 14 July: 112.7 µg/m³, 3.1× usual Los Ángeles, 15 July: 61.6 µg/m³, 1.7× usual Los Ángeles, 16 July: 61.7 µg/m³, 1.7× usual Los Ángeles, 17 July: 56.5 µg/m³, 1.6× usual La Unión La Unión, 8 July: no reading La Unión, 9 July: no reading La Unión, 10 July: 38.6 µg/m³, 0.9× usual La Unión, 11 July: 44.0 µg/m³, 1.0× usual La Unión, 12 July: no reading La Unión, 13 July: 91.7 µg/m³, 2.2× usual La Unión, 14 July: 109.0 µg/m³, 2.6× usual La Unión, 15 July: 45.5 µg/m³, 1.1× usual La Unión, 16 July: 49.1 µg/m³, 1.2× usual La Unión, 17 July: 61.6 µg/m³, 1.5× usual Valdivia Valdivia, 8 July: 31.8 µg/m³, 0.8× usual Valdivia, 9 July: 36.0 µg/m³, 0.9× usual Valdivia, 10 July: 53.3 µg/m³, 1.3× usual Valdivia, 11 July: no reading Valdivia, 12 July: no reading Valdivia, 13 July: 87.5 µg/m³, 2.1× usual Valdivia, 14 July: 95.0 µg/m³, 2.3× usual Valdivia, 15 July: 50.8 µg/m³, 1.2× usual Valdivia, 16 July: 76.0 µg/m³, 1.9× usual Valdivia, 17 July: 68.2 µg/m³, 1.7× usual Quilpué Quilpué, 8 July: 50.2 µg/m³, 1.4× usual Quilpué, 9 July: 56.0 µg/m³, 1.6× usual Quilpué, 10 July: 27.0 µg/m³, 0.8× usual Quilpué, 11 July: 33.8 µg/m³, 0.9× usual Quilpué, 12 July: 58.4 µg/m³, 1.6× usual Quilpué, 13 July: 74.0 µg/m³, 2.1× usual Quilpué, 14 July: 75.8 µg/m³, 2.1× usual Quilpué, 15 July: 60.8 µg/m³, 1.7× usual Quilpué, 16 July: 72.3 µg/m³, 2.0× usual Quilpué, 17 July: 61.6 µg/m³, 1.7× usual Puerto Montt Puerto Montt, 8 July: 54.9 µg/m³, 1.5× usual Puerto Montt, 9 July: 78.0 µg/m³, 2.1× usual Puerto Montt, 10 July: 41.0 µg/m³, 1.1× usual Puerto Montt, 11 July: 34.6 µg/m³, 0.9× usual Puerto Montt, 12 July: 43.8 µg/m³, 1.2× usual Puerto Montt, 13 July: 54.3 µg/m³, 1.5× usual Puerto Montt, 14 July: 162.5 µg/m³, 4.4× usual Puerto Montt, 15 July: 52.5 µg/m³, 1.4× usual Puerto Montt, 16 July: 46.3 µg/m³, 1.2× usual Puerto Montt, 17 July: 51.1 µg/m³, 1.4× usual Villarrica Villarrica, 8 July: 31.9 µg/m³, 0.5× usual Villarrica, 9 July: 32.5 µg/m³, 0.5× usual Villarrica, 10 July: 49.7 µg/m³, 0.8× usual Villarrica, 11 July: 95.0 µg/m³, 1.6× usual Villarrica, 12 July: 53.2 µg/m³, 0.9× usual Villarrica, 13 July: 68.9 µg/m³, 1.1× usual Villarrica, 14 July: 127.0 µg/m³, 2.1× usual Villarrica, 15 July: 127.0 µg/m³, 2.1× usual Villarrica, 16 July: 111.0 µg/m³, 1.8× usual Villarrica, 17 July: 72.2 µg/m³, 1.2× usual Rengo Rengo, 8 July: 67.0 µg/m³, 1.2× usual Rengo, 9 July: 70.0 µg/m³, 1.3× usual Rengo, 10 July: 73.3 µg/m³, 1.3× usual Rengo, 11 July: 83.4 µg/m³, 1.5× usual Rengo, 12 July: no reading Rengo, 13 July: 106.0 µg/m³, 1.9× usual Rengo, 14 July: 125.0 µg/m³, 2.3× usual Rengo, 15 July: 82.5 µg/m³, 1.5× usual Rengo, 16 July: 87.9 µg/m³, 1.6× usual Rengo, 17 July: 87.5 µg/m³, 1.6× usual Osorno Osorno, 8 July: 49.8 µg/m³, 0.9× usual Osorno, 9 July: 27.6 µg/m³, 0.5× usual Osorno, 10 July: 29.6 µg/m³, 0.5× usual Osorno, 11 July: 41.3 µg/m³, 0.7× usual Osorno, 12 July: 39.7 µg/m³, 0.7× usual Osorno, 13 July: 71.2 µg/m³, 1.2× usual Osorno, 14 July: 117.5 µg/m³, 2.0× usual Osorno, 15 July: 64.4 µg/m³, 1.1× usual Osorno, 16 July: 94.8 µg/m³, 1.6× usual Osorno, 17 July: 108.0 µg/m³, 1.9× usual Talagante Talagante, 8 July: 75.2 µg/m³, 1.5× usual Talagante, 9 July: no reading Talagante, 10 July: 36.6 µg/m³, 0.7× usual Talagante, 11 July: 66.3 µg/m³, 1.3× usual Talagante, 12 July: 78.8 µg/m³, 1.6× usual Talagante, 13 July: 70.8 µg/m³, 1.4× usual Talagante, 14 July: 107.0 µg/m³, 2.2× usual Talagante, 15 July: 79.3 µg/m³, 1.6× usual Talagante, 16 July: 89.2 µg/m³, 1.8× usual Talagante, 17 July: 78.3 µg/m³, 1.6× usual Santiago Santiago, 8 July: 71.4 µg/m³, 1.4× usual Santiago, 9 July: 78.6 µg/m³, 1.6× usual Santiago, 10 July: 39.8 µg/m³, 0.8× usual Santiago, 11 July: 63.1 µg/m³, 1.3× usual Santiago, 12 July: 76.0 µg/m³, 1.5× usual Santiago, 13 July: 86.6 µg/m³, 1.7× usual Santiago, 14 July: 105.4 µg/m³, 2.1× usual Santiago, 15 July: 92.6 µg/m³, 1.8× usual Santiago, 16 July: 80.1 µg/m³, 1.6× usual Santiago, 17 July: 64.2 µg/m³, 1.3× usual Quillota Quillota, 8 July: 59.6 µg/m³, 1.7× usual Quillota, 9 July: 65.5 µg/m³, 1.9× usual Quillota, 10 July: 47.1 µg/m³, 1.4× usual Quillota, 11 July: 43.1 µg/m³, 1.3× usual Quillota, 12 July: 59.8 µg/m³, 1.8× usual Quillota, 13 July: 65.8 µg/m³, 1.9× usual Quillota, 14 July: 73.1 µg/m³, 2.1× usual Quillota, 15 July: 64.8 µg/m³, 1.9× usual Quillota, 16 July: 66.1 µg/m³, 1.9× usual Quillota, 17 July: 56.7 µg/m³, 1.7× usual Quintero Quintero, 8 July: 40.9 µg/m³, 1.5× usual Quintero, 9 July: 38.5 µg/m³, 1.4× usual Quintero, 10 July: 29.7 µg/m³, 1.1× usual Quintero, 11 July: 30.7 µg/m³, 1.1× usual Quintero, 12 July: no reading Quintero, 13 July: 44.1 µg/m³, 1.6× usual Quintero, 14 July: 53.8 µg/m³, 2.0× usual Quintero, 15 July: 48.1 µg/m³, 1.8× usual Quintero, 16 July: 46.4 µg/m³, 1.7× usual Quintero, 17 July: 40.1 µg/m³, 1.5× usual Viña del Mar Viña del Mar, 8 July: 35.1 µg/m³, 1.5× usual Viña del Mar, 9 July: 37.9 µg/m³, 1.6× usual Viña del Mar, 10 July: 23.6 µg/m³, 1.0× usual Viña del Mar, 11 July: no reading Viña del Mar, 12 July: no reading Viña del Mar, 13 July: no reading Viña del Mar, 14 July: 52.3 µg/m³, 2.2× usual Viña del Mar, 15 July: 42.3 µg/m³, 1.8× usual Viña del Mar, 16 July: 58.9 µg/m³, 2.5× usual Viña del Mar, 17 July: 46.7 µg/m³, 2.0× usual 8 Jul 9 10 11 12 13 14 15 16 17 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
Cauquenes Maule Region, Chile 2 11 July 39.5 6.5× Puerto Montt Los Lagos Region, Chile 1 14 July 37.3 4.4× Talcahuano Biobio, Chile 2 10 July 38.3 4.2× Rancagua O'Higgins Region, Chile 2 14 July 52.5 3.9× Chiguayante Biobio, Chile 2 9 July 29.2 3.4× Chillán Ñuble, Chile 1 13 July 40.0 3.2× Los Ángeles Biobio, Chile 2 14 July 35.8 3.1× Curicó Maule Region, Chile 2 13 July 49.5 3.0× Temuco Araucania, Chile 3 12 July 45.2 2.8× Curanilahue Biobio, Chile 2 12 July 46.9 2.8× Hualpén Biobio, Chile 2 11 July 62.7 2.7× La Unión Los Ríos Region, Chile 2 14 July 42.3 2.6× Viña del Mar Valparaiso, Chile 1 16 July 23.4 2.5× Valdivia Los Ríos Region, Chile 2 14 July 41.0 2.3× Nacimiento Biobio, Chile 1 12 July 69.7 2.3× Rengo O'Higgins Region, Chile 1 14 July 54.7 2.3× Talagante Santiago Metropolitan, Chile 1 14 July 49.3 2.2× Quillota Valparaiso, Chile 1 14 July 34.1 2.1× Lota Biobio, Chile 1 12 July 19.0 2.1× Villarrica Araucania, Chile 1 14 July 60.3 2.1× Quilpué Valparaiso, Chile 2 14 July 36.0 2.1× Santiago Santiago Metropolitan, Chile 1 14 July 50.4 2.1× Osorno Los Lagos Region, Chile 1 14 July 58.0 2.0× Quintero Valparaiso, Chile 1 14 July 26.8 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
The largest 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, July 2024: 24 cities with PM2.5 at twice their usual or more, 11 to 14 July 2024, smogrank.com/episodes/2024-07-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.
