SmogRank / Episodes / Chile

Biobio and Ñuble, Chile, June 2023

For 1 day, on 14 June 2023, 8 cities in Chile had PM2.5 at least twice their usual for the time of year. The worst reading was Chillán, Ñuble, Chile: 207.0 µg/m³ on 14 June, about 4.8× its usual 43.1.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached8in 1 country
Days114 June 2023
Worst day14 June8 cities counted
Furthest above usual4.8×Chillán

Day by day

14 June 8 cities at twice their usual or more
Los ÁngelesNacimientoHualquiChiguayanteCoronelConcepciónSan Pedro de la PazCuranilahueCauquenesTalcaCuricóHualpénToméTalcahuanoLinaresLotaTemucoSan CarlosChillán
11 Jun121314151617
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

TemucoTemuco, 11 June: 129.0 µg/m³, 2.5× usualTemuco, 12 June: 124.0 µg/m³, 2.4× usualTemuco, 13 June: 97.3 µg/m³, 1.9× usualTemuco, 14 June: 141.0 µg/m³, 2.7× usualTemuco, 15 June: 133.0 µg/m³, 2.6× usualTemuco, 16 June: 49.8 µg/m³, 1.0× usualTemuco, 17 June: 104.0 µg/m³, 2.0× usualChillánChillán, 11 June: 23.2 µg/m³, 0.5× usualChillán, 12 June: 26.0 µg/m³, 0.6× usualChillán, 13 June: 74.5 µg/m³, 1.7× usualChillán, 14 June: 207.0 µg/m³, 4.8× usualChillán, 15 June: 75.3 µg/m³, 1.7× usualChillán, 16 June: 35.2 µg/m³, 0.8× usualChillán, 17 June: 67.5 µg/m³, 1.6× usualSan CarlosSan Carlos, 11 June: 25.7 µg/m³, 0.6× usualSan Carlos, 12 June: 28.0 µg/m³, 0.6× usualSan Carlos, 13 June: 64.5 µg/m³, 1.4× usualSan Carlos, 14 June: 165.0 µg/m³, 3.5× usualSan Carlos, 15 June: 73.1 µg/m³, 1.6× usualSan Carlos, 16 June: 45.8 µg/m³, 1.0× usualSan Carlos, 17 June: 70.5 µg/m³, 1.5× usualLinaresLinares, 11 June: 33.5 µg/m³, 0.6× usualLinares, 12 June: 60.1 µg/m³, 1.0× usualLinares, 13 June: 86.5 µg/m³, 1.4× usualLinares, 14 June: 137.0 µg/m³, 2.3× usualLinares, 15 June: 136.0 µg/m³, 2.3× usualLinares, 16 June: 75.0 µg/m³, 1.3× usualLinares, 17 June: 42.8 µg/m³, 0.7× usualHualpénHualpén, 11 June: 99.9 µg/m³, 1.5× usualHualpén, 12 June: 125.0 µg/m³, 1.9× usualHualpén, 13 June: 63.9 µg/m³, 1.0× usualHualpén, 14 June: 132.0 µg/m³, 2.0× usualHualpén, 15 June: 66.2 µg/m³, 1.0× usualHualpén, 16 June: no readingHualpén, 17 June: no readingTalcahuanoTalcahuano, 11 June: 48.2 µg/m³, 1.1× usualTalcahuano, 12 June: 58.8 µg/m³, 1.3× usualTalcahuano, 13 June: 46.4 µg/m³, 1.1× usualTalcahuano, 14 June: 90.9 µg/m³, 2.1× usualTalcahuano, 15 June: 42.2 µg/m³, 1.0× usualTalcahuano, 16 June: 30.3 µg/m³, 0.7× usualTalcahuano, 17 June: 40.4 µg/m³, 0.9× usualToméTomé, 11 June: 37.2 µg/m³, 1.2× usualTomé, 12 June: 32.3 µg/m³, 1.0× usualTomé, 13 June: 32.4 µg/m³, 1.0× usualTomé, 14 June: 64.5 µg/m³, 2.0× usualTomé, 15 June: 56.4 µg/m³, 1.8× usualTomé, 16 June: 43.4 µg/m³, 1.4× usualTomé, 17 June: 30.0 µg/m³, 0.9× usualLotaLota, 11 June: 16.7 µg/m³, 0.8× usualLota, 12 June: 19.3 µg/m³, 1.0× usualLota, 13 June: 33.5 µg/m³, 1.7× usualLota, 14 June: 49.0 µg/m³, 2.4× usualLota, 15 June: 33.6 µg/m³, 1.7× usualLota, 16 June: 25.3 µg/m³, 1.3× usualLota, 17 June: 35.3 µg/m³, 1.7× usual11 Jun121314151617
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.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

Every city it reached

CityDaysHighestUsualAbove usual
ChillánÑuble, Chile1 207.014 June43.14.8×
San CarlosÑuble, Chile1 165.014 June46.73.5×
TemucoAraucania, Chile1 141.014 June52.12.7×
LotaBiobio, Chile1 49.014 June20.22.4×
LinaresMaule Region, Chile1 137.014 June60.02.3×
TalcahuanoBiobio, Chile1 90.914 June43.82.1×
ToméBiobio, Chile1 64.514 June31.82.0×
HualpénBiobio, Chile1 132.014 June65.92.0×

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 30 of 30 episodes in Chile since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 30.

Use this page

SmogRank, Biobio and Ñuble, Chile, June 2023: 8 cities with PM2.5 at twice their usual or more, 14 June 2023, smogrank.com/episodes/2023-06-biobio-and-nuble-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.