SmogRank / Episodes / Chile
South-western Chile, July 2024
For 2 days, from 30 to 31 July 2024, 17 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: 180.0 µg/m³ on 30 July, about 3.2× its usual 55.7.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 17 in 1 country
Days 2 30 to 31 July 2024
Worst day 30 July 14 cities counted
Furthest above usual 3.2× Osorno
Day by day
Play 30 July 14 cities at twice their usual or more
Temuco Curanilahue Concepción San Pedro de la Paz Tomé Talcahuano La Unión Puerto Montt Talagante Puente Alto Curicó Rancagua Chiguayante Hualpén Nacimiento Puerto Varas Rengo Villarrica Coronel Hualqui Talca Chillán Lota Valdivia Cauquenes Los Ángeles Osorno 27 Jul 28 29 30 31 1 Aug 2 3 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
Osorno Osorno, 27 July: 51.9 µg/m³, 0.9× usual Osorno, 28 July: 160.5 µg/m³, 2.9× usual Osorno, 29 July: 133.0 µg/m³, 2.4× usual Osorno, 30 July: 180.0 µg/m³, 3.2× usual Osorno, 31 July: 60.3 µg/m³, 1.1× usual Osorno, 1 August: 27.7 µg/m³, 0.5× usual Osorno, 2 August: 29.4 µg/m³, 0.5× usual Osorno, 3 August: 35.9 µg/m³, 0.6× usual Lota Lota, 27 July: 19.8 µg/m³, 1.0× usual Lota, 28 July: no reading Lota, 29 July: 40.4 µg/m³, 2.1× usual Lota, 30 July: 48.3 µg/m³, 2.5× usual Lota, 31 July: no reading Lota, 1 August: no reading Lota, 2 August: no reading Lota, 3 August: no reading Nacimiento Nacimiento, 27 July: 87.4 µg/m³, 1.3× usual Nacimiento, 28 July: 31.9 µg/m³, 0.5× usual Nacimiento, 29 July: 81.1 µg/m³, 1.2× usual Nacimiento, 30 July: 139.5 µg/m³, 2.1× usual Nacimiento, 31 July: 127.0 µg/m³, 1.9× usual Nacimiento, 1 August: no reading Nacimiento, 2 August: no reading Nacimiento, 3 August: 48.3 µg/m³, 0.7× usual Hualpén Hualpén, 27 July: 86.3 µg/m³, 1.6× usual Hualpén, 28 July: 75.9 µg/m³, 1.4× usual Hualpén, 29 July: 69.6 µg/m³, 1.3× usual Hualpén, 30 July: 111.0 µg/m³, 2.1× usual Hualpén, 31 July: 40.0 µg/m³, 0.7× usual Hualpén, 1 August: no reading Hualpén, 2 August: no reading Hualpén, 3 August: 63.3 µg/m³, 1.2× usual Puerto Varas Puerto Varas, 27 July: 56.6 µg/m³, 1.1× usual Puerto Varas, 28 July: 76.3 µg/m³, 1.4× usual Puerto Varas, 29 July: 92.7 µg/m³, 1.7× usual Puerto Varas, 30 July: 110.0 µg/m³, 2.1× usual Puerto Varas, 31 July: 25.9 µg/m³, 0.5× usual Puerto Varas, 1 August: no reading Puerto Varas, 2 August: no reading Puerto Varas, 3 August: 34.3 µg/m³, 0.6× usual Villarrica Villarrica, 27 July: 96.4 µg/m³, 1.8× usual Villarrica, 28 July: 67.3 µg/m³, 1.3× usual Villarrica, 29 July: 39.5 µg/m³, 0.7× usual Villarrica, 30 July: 106.0 µg/m³, 2.0× usual Villarrica, 31 July: 115.0 µg/m³, 2.2× usual Villarrica, 1 August: 20.7 µg/m³, 0.4× usual Villarrica, 2 August: no reading Villarrica, 3 August: 34.0 µg/m³, 0.6× usual Valdivia Valdivia, 27 July: no reading Valdivia, 28 July: no reading Valdivia, 29 July: no reading Valdivia, 30 July: 102.0 µg/m³, 2.4× usual Valdivia, 31 July: 107.0 µg/m³, 2.5× usual Valdivia, 1 August: 25.3 µg/m³, 0.6× usual Valdivia, 2 August: no reading Valdivia, 3 August: 22.5 µg/m³, 0.5× usual Hualqui Hualqui, 27 July: 47.5 µg/m³, 1.1× usual Hualqui, 28 July: 43.5 µg/m³, 1.0× usual Hualqui, 29 July: 80.9 µg/m³, 1.9× usual Hualqui, 30 July: 102.0 µg/m³, 2.4× usual Hualqui, 31 July: 86.4 µg/m³, 2.1× usual Hualqui, 1 August: 23.5 µg/m³, 0.6× usual Hualqui, 2 August: 21.4 µg/m³, 0.5× usual Hualqui, 3 August: 27.1 µg/m³, 0.6× usual Chillán Chillán, 27 July: 30.2 µg/m³, 0.8× usual Chillán, 28 July: 21.3 µg/m³, 0.5× usual Chillán, 29 July: 41.4 µg/m³, 1.0× usual Chillán, 30 July: 98.0 µg/m³, 2.5× usual Chillán, 31 July: 88.3 µg/m³, 2.2× usual Chillán, 1 August: 25.6 µg/m³, 0.6× usual Chillán, 2 August: 18.7 µg/m³, 0.5× usual Chillán, 3 August: 25.4 µg/m³, 0.6× usual Coronel Coronel, 27 July: 55.4 µg/m³, 1.4× usual Coronel, 28 July: 45.4 µg/m³, 1.1× usual Coronel, 29 July: 76.7 µg/m³, 1.9× usual Coronel, 30 July: 97.8 µg/m³, 2.4× usual Coronel, 31 July: 60.5 µg/m³, 1.5× usual Coronel, 1 August: 24.0 µg/m³, 0.6× usual Coronel, 2 August: no reading Coronel, 3 August: 29.6 µg/m³, 0.7× usual Curicó Curicó, 27 July: 40.5 µg/m³, 0.9× usual Curicó, 28 July: no reading Curicó, 29 July: 44.1 µg/m³, 1.0× usual Curicó, 30 July: 94.7 µg/m³, 2.0× usual Curicó, 31 July: 82.2 µg/m³, 1.8× usual Curicó, 1 August: 29.8 µg/m³, 0.6× usual Curicó, 2 August: 20.2 µg/m³, 0.4× usual Curicó, 3 August: 20.8 µg/m³, 0.4× usual Los Ángeles Los Ángeles, 27 July: 51.3 µg/m³, 1.4× usual Los Ángeles, 28 July: 26.8 µg/m³, 0.7× usual Los Ángeles, 29 July: 28.4 µg/m³, 0.8× usual Los Ángeles, 30 July: 91.2 µg/m³, 2.5× usual Los Ángeles, 31 July: 111.0 µg/m³, 3.1× usual Los Ángeles, 1 August: 27.3 µg/m³, 0.8× usual Los Ángeles, 2 August: 20.3 µg/m³, 0.6× usual Los Ángeles, 3 August: 20.4 µg/m³, 0.6× usual Talca Talca, 27 July: 33.0 µg/m³, 0.9× usual Talca, 28 July: 22.0 µg/m³, 0.6× usual Talca, 29 July: 42.8 µg/m³, 1.2× usual Talca, 30 July: 86.3 µg/m³, 2.4× usual Talca, 31 July: 74.0 µg/m³, 2.0× usual Talca, 1 August: 21.8 µg/m³, 0.6× usual Talca, 2 August: 14.7 µg/m³, 0.4× usual Talca, 3 August: 18.9 µg/m³, 0.5× usual Chiguayante Chiguayante, 27 July: 39.5 µg/m³, 1.4× usual Chiguayante, 28 July: 35.3 µg/m³, 1.3× usual Chiguayante, 29 July: 40.6 µg/m³, 1.5× usual Chiguayante, 30 July: 58.5 µg/m³, 2.1× usual Chiguayante, 31 July: 45.6 µg/m³, 1.7× usual Chiguayante, 1 August: 21.0 µg/m³, 0.8× usual Chiguayante, 2 August: 21.1 µg/m³, 0.8× usual Chiguayante, 3 August: 20.7 µg/m³, 0.7× usual Rancagua Rancagua, 27 July: 44.4 µg/m³, 1.0× usual Rancagua, 28 July: 52.5 µg/m³, 1.2× usual Rancagua, 29 July: 79.4 µg/m³, 1.8× usual Rancagua, 30 July: 71.8 µg/m³, 1.6× usual Rancagua, 31 July: 95.8 µg/m³, 2.1× usual Rancagua, 1 August: 53.4 µg/m³, 1.2× usual Rancagua, 2 August: 24.8 µg/m³, 0.6× usual Rancagua, 3 August: 16.0 µg/m³, 0.4× usual Rengo Rengo, 27 July: 38.7 µg/m³, 0.9× usual Rengo, 28 July: 51.8 µg/m³, 1.2× usual Rengo, 29 July: no reading Rengo, 30 July: 84.7 µg/m³, 1.9× usual Rengo, 31 July: 95.3 µg/m³, 2.2× usual Rengo, 1 August: 60.1 µg/m³, 1.4× usual Rengo, 2 August: no reading Rengo, 3 August: 18.0 µg/m³, 0.4× usual Cauquenes Cauquenes, 27 July: 30.6 µg/m³, 0.9× usual Cauquenes, 28 July: 23.3 µg/m³, 0.7× usual Cauquenes, 29 July: 45.7 µg/m³, 1.4× usual Cauquenes, 30 July: 63.2 µg/m³, 1.9× usual Cauquenes, 31 July: 93.7 µg/m³, 2.9× usual Cauquenes, 1 August: 20.5 µg/m³, 0.6× usual Cauquenes, 2 August: 18.0 µg/m³, 0.5× usual Cauquenes, 3 August: 28.5 µg/m³, 0.9× usual 27 Jul 28 29 30 31 1 Aug 2 3 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 1 30 July 55.7 3.2× Los Ángeles Biobio, Chile 2 31 July 36.3 3.1× Cauquenes Maule Region, Chile 1 31 July 32.8 2.9× Lota Biobio, Chile 1 30 July 19.4 2.5× Valdivia Los Ríos Region, Chile 2 31 July 43.2 2.5× Chillán Ñuble, Chile 2 30 July 39.9 2.5× Hualqui Biobio, Chile 2 30 July 41.9 2.4× Coronel Biobio, Chile 1 30 July 40.3 2.4× Talca Maule Region, Chile 1 30 July 36.6 2.4× Villarrica Araucania, Chile 2 31 July 52.8 2.2× Rengo O'Higgins Region, Chile 1 31 July 43.8 2.2× Rancagua O'Higgins Region, Chile 1 31 July 44.7 2.1× Chiguayante Biobio, Chile 1 30 July 27.6 2.1× Nacimiento Biobio, Chile 1 30 July 66.9 2.1× Hualpén Biobio, Chile 1 30 July 53.5 2.1× Puerto Varas Los Lagos Region, Chile 1 30 July 53.2 2.1× Curicó Maule Region, Chile 1 30 July 46.4 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 7 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: 17 cities with PM2.5 at twice their usual or more, 30 to 31 July 2024, smogrank.com/episodes/2024-07-south-western-chile-2 (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.
