SmogRank / Episodes / Chile
Biobio, Chile, July 2024
For 4 days, from 20 to 23 July 2024, 15 cities in Chile had PM2.5 at least twice their usual for the time of year. The worst reading was Temuco, Araucania, Chile: 179.0 µg/m³ on 22 July, about 4.0× its usual 44.8.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 15 in 1 country
Days 4 20 to 23 July 2024
Worst day 22 July 11 cities counted
Furthest above usual 4.0× Temuco
Day by day
Play 22 July 11 cities at twice their usual or more
San Pedro de la Paz Villarrica Valdivia Cauquenes La Unión Concepción Coronel Talca Nacimiento Chiguayante Hualqui Hualpén Talcahuano Tomé Chillán Osorno Lota Curanilahue Los Ángeles Temuco 17 Jul 18 19 20 21 22 23 24 25 26 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, 17 July: 97.1 µg/m³, 2.4× usual Chillán, 18 July: 68.9 µg/m³, 1.7× usual Chillán, 19 July: 26.8 µg/m³, 0.7× usual Chillán, 20 July: 87.9 µg/m³, 2.2× usual Chillán, 21 July: 73.7 µg/m³, 1.8× usual Chillán, 22 July: 88.0 µg/m³, 2.2× usual Chillán, 23 July: 106.7 µg/m³, 2.7× usual Chillán, 24 July: 54.6 µg/m³, 1.4× usual Chillán, 25 July: 54.1 µg/m³, 1.3× usual Chillán, 26 July: 35.2 µg/m³, 0.9× usual Talca Talca, 17 July: 87.6 µg/m³, 2.2× usual Talca, 18 July: 83.9 µg/m³, 2.1× usual Talca, 19 July: 25.2 µg/m³, 0.6× usual Talca, 20 July: 73.4 µg/m³, 1.8× usual Talca, 21 July: 84.1 µg/m³, 2.1× usual Talca, 22 July: 84.6 µg/m³, 2.1× usual Talca, 23 July: 70.9 µg/m³, 1.8× usual Talca, 24 July: 65.3 µg/m³, 1.6× usual Talca, 25 July: 85.0 µg/m³, 2.1× usual Talca, 26 July: 70.4 µg/m³, 1.8× usual Hualqui Hualqui, 17 July: no reading Hualqui, 18 July: 39.3 µg/m³, 0.9× usual Hualqui, 19 July: 47.3 µg/m³, 1.1× usual Hualqui, 20 July: 89.5 µg/m³, 2.1× usual Hualqui, 21 July: 82.7 µg/m³, 2.0× usual Hualqui, 22 July: 78.8 µg/m³, 1.9× usual Hualqui, 23 July: 93.9 µg/m³, 2.2× usual Hualqui, 24 July: 106.0 µg/m³, 2.5× usual Hualqui, 25 July: 46.7 µg/m³, 1.1× usual Hualqui, 26 July: 54.6 µg/m³, 1.3× usual Chiguayante Chiguayante, 17 July: 42.5 µg/m³, 1.4× usual Chiguayante, 18 July: 36.5 µg/m³, 1.2× usual Chiguayante, 19 July: 35.7 µg/m³, 1.2× usual Chiguayante, 20 July: 63.6 µg/m³, 2.2× usual Chiguayante, 21 July: 62.9 µg/m³, 2.1× usual Chiguayante, 22 July: 54.7 µg/m³, 1.9× usual Chiguayante, 23 July: 55.0 µg/m³, 1.9× usual Chiguayante, 24 July: 43.3 µg/m³, 1.5× usual Chiguayante, 25 July: 26.1 µg/m³, 0.9× usual Chiguayante, 26 July: 36.6 µg/m³, 1.2× usual Tomé Tomé, 17 July: no reading Tomé, 18 July: no reading Tomé, 19 July: 33.4 µg/m³, 1.2× usual Tomé, 20 July: 63.0 µg/m³, 2.2× usual Tomé, 21 July: 49.5 µg/m³, 1.7× usual Tomé, 22 July: 68.9 µg/m³, 2.4× usual Tomé, 23 July: 68.0 µg/m³, 2.3× usual Tomé, 24 July: 37.9 µg/m³, 1.3× usual Tomé, 25 July: 20.4 µg/m³, 0.7× usual Tomé, 26 July: 30.1 µg/m³, 1.0× usual Lota Lota, 17 July: 32.2 µg/m³, 1.7× usual Lota, 18 July: no reading Lota, 19 July: 19.4 µg/m³, 1.0× usual Lota, 20 July: 56.2 µg/m³, 2.9× usual Lota, 21 July: 40.6 µg/m³, 2.1× usual Lota, 22 July: 31.3 µg/m³, 1.6× usual Lota, 23 July: 36.1 µg/m³, 1.9× usual Lota, 24 July: 24.8 µg/m³, 1.3× usual Lota, 25 July: 21.2 µg/m³, 1.1× usual Lota, 26 July: 27.3 µg/m³, 1.4× usual Osorno Osorno, 17 July: 108.0 µg/m³, 1.9× usual Osorno, 18 July: 41.2 µg/m³, 0.7× usual Osorno, 19 July: 40.3 µg/m³, 0.7× usual Osorno, 20 July: 37.4 µg/m³, 0.7× usual Osorno, 21 July: 140.0 µg/m³, 2.5× usual Osorno, 22 July: 158.0 µg/m³, 2.8× usual Osorno, 23 July: 34.8 µg/m³, 0.6× usual Osorno, 24 July: 34.1 µg/m³, 0.6× usual Osorno, 25 July: 36.1 µg/m³, 0.6× usual Osorno, 26 July: 125.5 µg/m³, 2.3× usual Talcahuano Talcahuano, 17 July: 36.1 µg/m³, 0.9× usual Talcahuano, 18 July: 32.8 µg/m³, 0.9× usual Talcahuano, 19 July: 30.8 µg/m³, 0.8× usual Talcahuano, 20 July: 51.9 µg/m³, 1.4× usual Talcahuano, 21 July: 74.8 µg/m³, 2.0× usual Talcahuano, 22 July: 93.2 µg/m³, 2.4× usual Talcahuano, 23 July: 72.0 µg/m³, 1.9× usual Talcahuano, 24 July: 48.9 µg/m³, 1.3× usual Talcahuano, 25 July: 23.9 µg/m³, 0.6× usual Talcahuano, 26 July: 36.6 µg/m³, 1.0× usual Temuco Temuco, 17 July: 46.7 µg/m³, 1.0× usual Temuco, 18 July: 46.8 µg/m³, 1.0× usual Temuco, 19 July: 39.3 µg/m³, 0.9× usual Temuco, 20 July: 60.9 µg/m³, 1.4× usual Temuco, 21 July: 81.3 µg/m³, 1.8× usual Temuco, 22 July: 179.0 µg/m³, 4.0× usual Temuco, 23 July: 101.0 µg/m³, 2.3× usual Temuco, 24 July: 43.8 µg/m³, 1.0× usual Temuco, 25 July: 31.9 µg/m³, 0.7× usual Temuco, 26 July: 52.0 µg/m³, 1.2× usual Nacimiento Nacimiento, 17 July: 110.9 µg/m³, 1.6× usual Nacimiento, 18 July: 88.9 µg/m³, 1.3× usual Nacimiento, 19 July: 29.8 µg/m³, 0.4× usual Nacimiento, 20 July: 80.2 µg/m³, 1.2× usual Nacimiento, 21 July: 73.5 µg/m³, 1.1× usual Nacimiento, 22 July: 139.4 µg/m³, 2.1× usual Nacimiento, 23 July: 150.9 µg/m³, 2.2× usual Nacimiento, 24 July: 108.0 µg/m³, 1.6× usual Nacimiento, 25 July: 55.8 µg/m³, 0.8× usual Nacimiento, 26 July: 54.9 µg/m³, 0.8× usual Curanilahue Curanilahue, 17 July: 54.3 µg/m³, 1.3× usual Curanilahue, 18 July: 56.0 µg/m³, 1.3× usual Curanilahue, 19 July: 32.3 µg/m³, 0.8× usual Curanilahue, 20 July: 46.9 µg/m³, 1.1× usual Curanilahue, 21 July: 43.4 µg/m³, 1.0× usual Curanilahue, 22 July: 128.0 µg/m³, 3.0× usual Curanilahue, 23 July: 115.0 µg/m³, 2.7× usual Curanilahue, 24 July: 72.5 µg/m³, 1.7× usual Curanilahue, 25 July: 39.2 µg/m³, 0.9× usual Curanilahue, 26 July: 40.0 µg/m³, 0.9× usual Hualpén Hualpén, 17 July: 48.7 µg/m³, 0.9× usual Hualpén, 18 July: 48.1 µg/m³, 0.8× usual Hualpén, 19 July: 29.5 µg/m³, 0.5× usual Hualpén, 20 July: 65.3 µg/m³, 1.2× usual Hualpén, 21 July: no reading Hualpén, 22 July: 128.0 µg/m³, 2.3× usual Hualpén, 23 July: 131.0 µg/m³, 2.3× usual Hualpén, 24 July: 105.0 µg/m³, 1.9× usual Hualpén, 25 July: 63.8 µg/m³, 1.1× usual Hualpén, 26 July: 84.4 µg/m³, 1.5× usual Los Ángeles Los Ángeles, 17 July: 56.5 µg/m³, 1.5× usual Los Ángeles, 18 July: 70.0 µg/m³, 1.9× usual Los Ángeles, 19 July: 27.6 µg/m³, 0.7× usual Los Ángeles, 20 July: 23.5 µg/m³, 0.6× usual Los Ángeles, 21 July: 30.3 µg/m³, 0.8× usual Los Ángeles, 22 July: 81.8 µg/m³, 2.2× usual Los Ángeles, 23 July: 138.8 µg/m³, 3.8× usual Los Ángeles, 24 July: 42.8 µg/m³, 1.2× usual Los Ángeles, 25 July: 28.3 µg/m³, 0.8× usual Los Ángeles, 26 July: 28.0 µg/m³, 0.8× usual Concepción Concepción, 17 July: 38.3 µg/m³, 1.3× usual Concepción, 18 July: no reading Concepción, 19 July: 24.5 µg/m³, 0.8× usual Concepción, 20 July: 53.5 µg/m³, 1.8× usual Concepción, 21 July: 56.0 µg/m³, 1.8× usual Concepción, 22 July: 61.0 µg/m³, 2.0× usual Concepción, 23 July: 60.5 µg/m³, 2.0× usual Concepción, 24 July: 40.4 µg/m³, 1.3× usual Concepción, 25 July: 23.4 µg/m³, 0.8× usual Concepción, 26 July: 36.3 µg/m³, 1.2× usual Coronel Coronel, 17 July: 65.1 µg/m³, 1.6× usual Coronel, 18 July: 48.0 µg/m³, 1.2× usual Coronel, 19 July: 35.8 µg/m³, 0.9× usual Coronel, 20 July: 82.2 µg/m³, 2.0× usual Coronel, 21 July: 65.2 µg/m³, 1.6× usual Coronel, 22 July: 84.6 µg/m³, 2.1× usual Coronel, 23 July: 87.5 µg/m³, 2.1× usual Coronel, 24 July: 45.1 µg/m³, 1.1× usual Coronel, 25 July: 35.6 µg/m³, 0.9× usual Coronel, 26 July: 48.0 µg/m³, 1.2× usual 17 Jul 18 19 20 21 22 23 24 25 26 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
Temuco Araucania, Chile 2 22 July 44.8 4.0× Los Ángeles Biobio, Chile 2 23 July 37.0 3.8× Curanilahue Biobio, Chile 2 22 July 42.4 3.0× Lota Biobio, Chile 2 20 July 19.5 2.9× Osorno Los Lagos Region, Chile 1 22 July 55.6 2.8× Chillán Ñuble, Chile 3 23 July 40.1 2.7× Hualqui Biobio, Chile 2 24 July 42.0 2.5× Talcahuano Biobio, Chile 2 22 July 38.1 2.4× Tomé Biobio, Chile 3 22 July 29.0 2.4× Hualpén Biobio, Chile 2 23 July 56.6 2.3× Nacimiento Biobio, Chile 2 23 July 67.5 2.2× Talca Maule Region, Chile 2 17 July 39.7 2.2× Chiguayante Biobio, Chile 2 20 July 29.5 2.2× Coronel Biobio, Chile 1 23 July 41.0 2.1× Concepción Biobio, Chile 2 22 July 30.3 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 8 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, Biobio, Chile, July 2024: 15 cities with PM2.5 at twice their usual or more, 20 to 23 July 2024, smogrank.com/episodes/2024-07-biobio-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.
