SmogRank / Episodes / Chile
South-western Chile, June and July 2025
For 6 days, from 29 June to 4 July 2025, 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: 290.5 µg/m³ on 2 July, about 5.0× its usual 58.1.
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 6 29 June to 4 July 2025
Worst day 2 July 11 cities counted
Furthest above usual 5.9× Los Ángeles
Day by day
Play 2 July 11 cities at twice their usual or more
Lota Chiguayante Concepción San Pedro de la Paz Hualpén Talcahuano Tomé Cauquenes Curicó Coronel Hualqui Nacimiento Talca Villarrica Temuco La Unión Curanilahue Puerto Montt Puerto Varas Valdivia Linares Osorno San Carlos Chillán Los Ángeles 26 Jun 27 28 29 30 1 Jul 2 3 4 5 6 7 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
Los Ángeles Los Ángeles, 26 June: 100.2 µg/m³, 2.7× usual Los Ángeles, 27 June: 66.5 µg/m³, 1.8× usual Los Ángeles, 28 June: 53.9 µg/m³, 1.5× usual Los Ángeles, 29 June: 71.7 µg/m³, 2.0× usual Los Ángeles, 30 June: 33.8 µg/m³, 0.9× usual Los Ángeles, 1 July: 64.9 µg/m³, 1.8× usual Los Ángeles, 2 July: 157.5 µg/m³, 4.3× usual Los Ángeles, 3 July: 216.0 µg/m³, 5.9× usual Los Ángeles, 4 July: 63.7 µg/m³, 1.7× usual Los Ángeles, 5 July: 111.7 µg/m³, 3.1× usual Los Ángeles, 6 July: 25.2 µg/m³, 0.7× usual Los Ángeles, 7 July: 21.7 µg/m³, 0.6× usual San Carlos San Carlos, 26 June: 91.7 µg/m³, 2.2× usual San Carlos, 27 June: 96.6 µg/m³, 2.3× usual San Carlos, 28 June: 75.2 µg/m³, 1.8× usual San Carlos, 29 June: 68.7 µg/m³, 1.7× usual San Carlos, 30 June: 51.8 µg/m³, 1.3× usual San Carlos, 1 July: 84.3 µg/m³, 2.0× usual San Carlos, 2 July: 184.0 µg/m³, 4.4× usual San Carlos, 3 July: 213.0 µg/m³, 5.1× usual San Carlos, 4 July: 83.9 µg/m³, 2.0× usual San Carlos, 5 July: 78.3 µg/m³, 1.9× usual San Carlos, 6 July: 19.0 µg/m³, 0.5× usual San Carlos, 7 July: 24.3 µg/m³, 0.6× usual Linares Linares, 26 June: 84.4 µg/m³, 1.6× usual Linares, 27 June: 104.0 µg/m³, 2.0× usual Linares, 28 June: 136.0 µg/m³, 2.6× usual Linares, 29 June: 112.0 µg/m³, 2.1× usual Linares, 30 June: 140.0 µg/m³, 2.7× usual Linares, 1 July: 142.0 µg/m³, 2.7× usual Linares, 2 July: 179.0 µg/m³, 3.4× usual Linares, 3 July: 214.0 µg/m³, 4.1× usual Linares, 4 July: 180.0 µg/m³, 3.4× usual Linares, 5 July: 90.8 µg/m³, 1.7× usual Linares, 6 July: 25.6 µg/m³, 0.5× usual Linares, 7 July: 33.8 µg/m³, 0.6× usual Chillán Chillán, 26 June: 71.0 µg/m³, 1.7× usual Chillán, 27 June: 93.0 µg/m³, 2.3× usual Chillán, 28 June: 68.0 µg/m³, 1.7× usual Chillán, 29 June: 67.7 µg/m³, 1.7× usual Chillán, 30 June: 53.0 µg/m³, 1.3× usual Chillán, 1 July: 73.2 µg/m³, 1.8× usual Chillán, 2 July: 172.0 µg/m³, 4.2× usual Chillán, 3 July: 237.5 µg/m³, 5.8× usual Chillán, 4 July: 87.8 µg/m³, 2.2× usual Chillán, 5 July: 91.4 µg/m³, 2.3× usual Chillán, 6 July: 22.7 µg/m³, 0.6× usual Chillán, 7 July: 25.9 µg/m³, 0.6× usual Talca Talca, 26 June: 64.9 µg/m³, 1.5× usual Talca, 27 June: 91.5 µg/m³, 2.2× usual Talca, 28 June: 69.8 µg/m³, 1.7× usual Talca, 29 June: 60.0 µg/m³, 1.4× usual Talca, 30 June: 67.9 µg/m³, 1.6× usual Talca, 1 July: 83.9 µg/m³, 2.0× usual Talca, 2 July: 103.0 µg/m³, 2.4× usual Talca, 3 July: 106.0 µg/m³, 2.5× usual Talca, 4 July: 100.0 µg/m³, 2.4× usual Talca, 5 July: 68.1 µg/m³, 1.6× usual Talca, 6 July: 29.0 µg/m³, 0.7× usual Talca, 7 July: 35.0 µg/m³, 0.8× usual Puerto Varas Puerto Varas, 26 June: 48.4 µg/m³, 0.9× usual Puerto Varas, 27 June: 71.3 µg/m³, 1.3× usual Puerto Varas, 28 June: 109.0 µg/m³, 2.0× usual Puerto Varas, 29 June: 161.0 µg/m³, 2.9× usual Puerto Varas, 30 June: 189.0 µg/m³, 3.4× usual Puerto Varas, 1 July: 97.9 µg/m³, 1.8× usual Puerto Varas, 2 July: 32.3 µg/m³, 0.6× usual Puerto Varas, 3 July: 28.3 µg/m³, 0.5× usual Puerto Varas, 4 July: 46.8 µg/m³, 0.8× usual Puerto Varas, 5 July: 75.3 µg/m³, 1.4× usual Puerto Varas, 6 July: 90.3 µg/m³, 1.6× usual Puerto Varas, 7 July: 25.7 µg/m³, 0.5× usual Curanilahue Curanilahue, 26 June: 54.9 µg/m³, 1.1× usual Curanilahue, 27 June: 60.1 µg/m³, 1.2× usual Curanilahue, 28 June: 63.0 µg/m³, 1.2× usual Curanilahue, 29 June: 114.0 µg/m³, 2.2× usual Curanilahue, 30 June: 165.0 µg/m³, 3.2× usual Curanilahue, 1 July: no reading Curanilahue, 2 July: no reading Curanilahue, 3 July: 103.0 µg/m³, 2.0× usual Curanilahue, 4 July: 99.9 µg/m³, 1.9× usual Curanilahue, 5 July: 85.5 µg/m³, 1.7× usual Curanilahue, 6 July: 29.2 µg/m³, 0.6× usual Curanilahue, 7 July: 28.7 µg/m³, 0.6× usual La Unión La Unión, 26 June: 70.3 µg/m³, 1.5× usual La Unión, 27 June: 79.7 µg/m³, 1.7× usual La Unión, 28 June: 58.4 µg/m³, 1.3× usual La Unión, 29 June: 110.0 µg/m³, 2.4× usual La Unión, 30 June: 142.0 µg/m³, 3.1× usual La Unión, 1 July: 120.0 µg/m³, 2.6× usual La Unión, 2 July: 110.0 µg/m³, 2.4× usual La Unión, 3 July: 43.8 µg/m³, 0.9× usual La Unión, 4 July: 49.6 µg/m³, 1.1× usual La Unión, 5 July: 40.3 µg/m³, 0.9× usual La Unión, 6 July: 37.1 µg/m³, 0.8× usual La Unión, 7 July: 20.4 µg/m³, 0.4× usual Valdivia Valdivia, 26 June: 37.1 µg/m³, 0.9× usual Valdivia, 27 June: 36.3 µg/m³, 0.8× usual Valdivia, 28 June: 65.8 µg/m³, 1.5× usual Valdivia, 29 June: 100.9 µg/m³, 2.3× usual Valdivia, 30 June: 113.1 µg/m³, 2.6× usual Valdivia, 1 July: 111.8 µg/m³, 2.6× usual Valdivia, 2 July: 156.5 µg/m³, 3.6× usual Valdivia, 3 July: 154.0 µg/m³, 3.6× usual Valdivia, 4 July: 84.6 µg/m³, 2.0× usual Valdivia, 5 July: 49.2 µg/m³, 1.1× usual Valdivia, 6 July: 71.6 µg/m³, 1.7× usual Valdivia, 7 July: 38.0 µg/m³, 0.9× usual Puerto Montt Puerto Montt, 26 June: 46.9 µg/m³, 1.1× usual Puerto Montt, 27 June: 47.5 µg/m³, 1.2× usual Puerto Montt, 28 June: 58.7 µg/m³, 1.4× usual Puerto Montt, 29 June: 85.7 µg/m³, 2.1× usual Puerto Montt, 30 June: 141.0 µg/m³, 3.4× usual Puerto Montt, 1 July: 79.8 µg/m³, 1.9× usual Puerto Montt, 2 July: 37.3 µg/m³, 0.9× usual Puerto Montt, 3 July: 27.0 µg/m³, 0.7× usual Puerto Montt, 4 July: 23.8 µg/m³, 0.6× usual Puerto Montt, 5 July: 62.0 µg/m³, 1.5× usual Puerto Montt, 6 July: 42.6 µg/m³, 1.0× usual Puerto Montt, 7 July: 30.5 µg/m³, 0.7× usual Osorno Osorno, 26 June: 51.9 µg/m³, 0.9× usual Osorno, 27 June: 49.8 µg/m³, 0.9× usual Osorno, 28 June: 58.0 µg/m³, 1.0× usual Osorno, 29 June: 111.5 µg/m³, 1.9× usual Osorno, 30 June: 211.0 µg/m³, 3.6× usual Osorno, 1 July: 218.5 µg/m³, 3.8× usual Osorno, 2 July: 290.5 µg/m³, 5.0× usual Osorno, 3 July: 118.4 µg/m³, 2.0× usual Osorno, 4 July: 66.1 µg/m³, 1.1× usual Osorno, 5 July: 47.6 µg/m³, 0.8× usual Osorno, 6 July: 72.4 µg/m³, 1.2× usual Osorno, 7 July: 41.8 µg/m³, 0.7× usual Temuco Temuco, 26 June: 33.8 µg/m³, 0.6× usual Temuco, 27 June: 39.7 µg/m³, 0.7× usual Temuco, 28 June: 55.3 µg/m³, 1.0× usual Temuco, 29 June: 88.7 µg/m³, 1.6× usual Temuco, 30 June: 130.0 µg/m³, 2.4× usual Temuco, 1 July: 127.0 µg/m³, 2.3× usual Temuco, 2 July: 137.0 µg/m³, 2.5× usual Temuco, 3 July: 169.0 µg/m³, 3.1× usual Temuco, 4 July: 167.0 µg/m³, 3.0× usual Temuco, 5 July: 120.0 µg/m³, 2.2× usual Temuco, 6 July: 23.3 µg/m³, 0.4× usual Temuco, 7 July: 22.5 µg/m³, 0.4× usual Villarrica Villarrica, 26 June: 30.4 µg/m³, 0.5× usual Villarrica, 27 June: 38.0 µg/m³, 0.6× usual Villarrica, 28 June: 56.4 µg/m³, 0.9× usual Villarrica, 29 June: no reading Villarrica, 30 June: no reading Villarrica, 1 July: no reading Villarrica, 2 July: 190.0 µg/m³, 3.1× usual Villarrica, 3 July: 192.0 µg/m³, 3.1× usual Villarrica, 4 July: 138.0 µg/m³, 2.2× usual Villarrica, 5 July: 63.7 µg/m³, 1.0× usual Villarrica, 6 July: 24.4 µg/m³, 0.4× usual Villarrica, 7 July: 30.9 µg/m³, 0.5× usual Hualqui Hualqui, 26 June: 73.1 µg/m³, 1.6× usual Hualqui, 27 June: 69.7 µg/m³, 1.5× usual Hualqui, 28 June: 59.4 µg/m³, 1.3× usual Hualqui, 29 June: 58.8 µg/m³, 1.3× usual Hualqui, 30 June: 68.3 µg/m³, 1.5× usual Hualqui, 1 July: 74.6 µg/m³, 1.6× usual Hualqui, 2 July: 93.1 µg/m³, 2.0× usual Hualqui, 3 July: 98.1 µg/m³, 2.1× usual Hualqui, 4 July: 88.8 µg/m³, 1.9× usual Hualqui, 5 July: 88.4 µg/m³, 1.9× usual Hualqui, 6 July: 35.0 µg/m³, 0.8× usual Hualqui, 7 July: 35.7 µg/m³, 0.8× usual Nacimiento Nacimiento, 26 June: 101.0 µg/m³, 1.4× usual Nacimiento, 27 June: 86.0 µg/m³, 1.2× usual Nacimiento, 28 June: 124.7 µg/m³, 1.8× usual Nacimiento, 29 June: 116.9 µg/m³, 1.6× usual Nacimiento, 30 June: 96.4 µg/m³, 1.4× usual Nacimiento, 1 July: 107.6 µg/m³, 1.5× usual Nacimiento, 2 July: 139.5 µg/m³, 2.0× usual Nacimiento, 3 July: 169.0 µg/m³, 2.4× usual Nacimiento, 4 July: 156.5 µg/m³, 2.2× usual Nacimiento, 5 July: 94.4 µg/m³, 1.3× usual Nacimiento, 6 July: 54.0 µg/m³, 0.8× usual Nacimiento, 7 July: 80.3 µg/m³, 1.1× usual Curicó Curicó, 26 June: 46.3 µg/m³, 0.8× usual Curicó, 27 June: 76.5 µg/m³, 1.3× usual Curicó, 28 June: 81.2 µg/m³, 1.4× usual Curicó, 29 June: no reading Curicó, 30 June: no reading Curicó, 1 July: 95.7 µg/m³, 1.7× usual Curicó, 2 July: 83.3 µg/m³, 1.5× usual Curicó, 3 July: 113.0 µg/m³, 2.0× usual Curicó, 4 July: 115.0 µg/m³, 2.0× usual Curicó, 5 July: 68.3 µg/m³, 1.2× usual Curicó, 6 July: 38.5 µg/m³, 0.7× usual Curicó, 7 July: 52.8 µg/m³, 0.9× usual Coronel Coronel, 26 June: 52.8 µg/m³, 1.2× usual Coronel, 27 June: 53.7 µg/m³, 1.2× usual Coronel, 28 June: 70.8 µg/m³, 1.5× usual Coronel, 29 June: 45.7 µg/m³, 1.0× usual Coronel, 30 June: 56.5 µg/m³, 1.2× usual Coronel, 1 July: 70.3 µg/m³, 1.5× usual Coronel, 2 July: 83.3 µg/m³, 1.8× usual Coronel, 3 July: 89.8 µg/m³, 2.0× usual Coronel, 4 July: 94.6 µg/m³, 2.1× usual Coronel, 5 July: 75.5 µg/m³, 1.6× usual Coronel, 6 July: 24.5 µg/m³, 0.5× usual Coronel, 7 July: 33.5 µg/m³, 0.7× usual 26 Jun 28 30 1 Jul 2 4 6 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
Los Ángeles Biobio, Chile 3 3 July 36.5 5.9× Chillán Ñuble, Chile 3 3 July 40.6 5.8× San Carlos Ñuble, Chile 3 3 July 41.4 5.1× Osorno Los Lagos Region, Chile 4 2 July 58.1 5.0× Linares Maule Region, Chile 6 3 July 52.4 4.1× Valdivia Los Ríos Region, Chile 5 2 July 43.1 3.6× Puerto Montt Los Lagos Region, Chile 2 30 June 41.1 3.4× Puerto Varas Los Lagos Region, Chile 2 30 June 55.5 3.4× Curanilahue Biobio, Chile 2 30 June 51.6 3.2× Villarrica Araucania, Chile 3 3 July 62.1 3.1× Temuco Araucania, Chile 5 3 July 55.0 3.1× La Unión Los Ríos Region, Chile 4 30 June 46.5 3.1× Talca Maule Region, Chile 4 3 July 42.1 2.5× Nacimiento Biobio, Chile 2 3 July 71.2 2.4× Hualqui Biobio, Chile 2 3 July 45.8 2.1× Coronel Biobio, Chile 1 4 July 45.9 2.1× Curicó Maule Region, Chile 1 4 July 57.3 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 3 of 11 episodes in Chile since our records began, by cities reached.
South-western Chile, July 2026 19 South-western Chile, May 2026 19 South-western Chile, June and July 2025 17 South-western Chile, August 2026 14 South-western Chile, May 2026 14 South-western Chile, June 2025 12 South-western Chile, August 2026 10 Biobio and Maule Region, Chile, January 2026 10 South-western Chile, August 2025 9 Southern Chile, June 2025 9 Los Lagos Region and Biobio, Chile, May 2026 8 Bars: cities reached; colour: the level of the episode's highest daily reading.
Use this page SmogRank, South-western Chile, June and July 2025: 17 cities with PM2.5 at twice their usual or more, 29 June to 4 July 2025, smogrank.com/episodes/2025-06-south-western-chile-2 (accessed 2 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.
