SmogRank / Episodes / Chile

Chile, April 2023

For 2 days, from 26 to 27 April 2023, 9 cities in Chile had PM2.5 at least twice their usual for the time of year. The worst reading was San Carlos, Ñuble, Chile: 127.0 µg/m³ on 26 April, about 3.8× its usual 33.1.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached9in 1 country
Days226 to 27 April 2023
Worst day26 April8 cities counted
Furthest above usual3.8×San Carlos

Day by day

26 April 8 cities at twice their usual or more
ToméConcepciónHualpénHualquiSan Pedro de la PazChiguayanteCoronelLotaRengoNacimientoCuranilahueTalagantePuente AltoSantiagoCauquenesTalcahuanoRancaguaLos ÁngelesCuricóTalcaLinaresChillánSan Carlos
23 Apr24252627282930
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

San CarlosSan Carlos, 23 April: 46.6 µg/m³San Carlos, 24 April: no readingSan Carlos, 25 April: no readingSan Carlos, 26 April: 127.0 µg/m³, 3.8× its usual 33.1San Carlos, 27 April: 118.0 µg/m³, 3.4× its usual 34.5San Carlos, 28 April: 37.3 µg/m³San Carlos, 29 April: 16.3 µg/m³San Carlos, 30 April: 15.0 µg/m³ChillánChillán, 23 April: 50.2 µg/m³Chillán, 24 April: no readingChillán, 25 April: no readingChillán, 26 April: 108.0 µg/m³, 3.3× its usual 32.9Chillán, 27 April: 109.5 µg/m³, 3.3× its usual 33.4Chillán, 28 April: 38.3 µg/m³Chillán, 29 April: 15.9 µg/m³Chillán, 30 April: 16.5 µg/m³LinaresLinares, 23 April: 49.4 µg/m³Linares, 24 April: no readingLinares, 25 April: no readingLinares, 26 April: 89.5 µg/m³, 2.5× its usual 35.7Linares, 27 April: 118.0 µg/m³, 3.1× its usual 37.5Linares, 28 April: 41.7 µg/m³Linares, 29 April: 16.7 µg/m³Linares, 30 April: 16.8 µg/m³TalcaTalca, 23 April: 27.0 µg/m³Talca, 24 April: no readingTalca, 25 April: no readingTalca, 26 April: 79.6 µg/m³, 2.8× its usual 28.8Talca, 27 April: 85.7 µg/m³, 2.9× its usual 29.4Talca, 28 April: 29.2 µg/m³Talca, 29 April: 12.8 µg/m³Talca, 30 April: 12.8 µg/m³CuricóCuricó, 23 April: 42.6 µg/m³Curicó, 24 April: no readingCuricó, 25 April: no readingCuricó, 26 April: 79.3 µg/m³, 2.4× its usual 33.0Curicó, 27 April: 79.1 µg/m³, 2.4× its usual 33.2Curicó, 28 April: 37.6 µg/m³Curicó, 29 April: 17.5 µg/m³Curicó, 30 April: 13.9 µg/m³Los ÁngelesLos Ángeles, 23 April: 17.8 µg/m³Los Ángeles, 24 April: no readingLos Ángeles, 25 April: no readingLos Ángeles, 26 April: 65.7 µg/m³, 2.3× its usual 28.3Los Ángeles, 27 April: 47.3 µg/m³Los Ángeles, 28 April: 21.4 µg/m³Los Ángeles, 29 April: 13.0 µg/m³Los Ángeles, 30 April: 15.3 µg/m³TalcahuanoTalcahuano, 23 April: 23.6 µg/m³Talcahuano, 24 April: no readingTalcahuano, 25 April: no readingTalcahuano, 26 April: 62.7 µg/m³, 2.2× its usual 27.9Talcahuano, 27 April: 30.6 µg/m³Talcahuano, 28 April: 17.5 µg/m³Talcahuano, 29 April: 18.0 µg/m³Talcahuano, 30 April: 22.9 µg/m³CauquenesCauquenes, 23 April: 27.6 µg/m³Cauquenes, 24 April: no readingCauquenes, 25 April: no readingCauquenes, 26 April: 54.0 µg/m³, 2.2× its usual 24.8Cauquenes, 27 April: 55.1 µg/m³, 2.2× its usual 25.1Cauquenes, 28 April: 19.3 µg/m³Cauquenes, 29 April: 12.1 µg/m³Cauquenes, 30 April: 13.5 µg/m³RancaguaRancagua, 23 April: 31.8 µg/m³Rancagua, 24 April: no readingRancagua, 25 April: no readingRancagua, 26 April: 53.7 µg/m³Rancagua, 27 April: 68.0 µg/m³, 2.2× its usual 30.7Rancagua, 28 April: 61.1 µg/m³Rancagua, 29 April: 25.4 µg/m³Rancagua, 30 April: 13.9 µg/m³23 Apr24252627282930
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
San CarlosÑuble, Chile2 127.026 April33.13.8×
ChillánÑuble, Chile2 109.527 April33.43.3×
LinaresMaule Region, Chile2 118.027 April37.53.1×
TalcaMaule Region, Chile2 85.727 April29.42.9×
CuricóMaule Region, Chile2 79.326 April33.02.4×
Los ÁngelesBiobio, Chile1 65.726 April28.32.3×
RancaguaO'Higgins Region, Chile1 68.027 April30.72.2×
TalcahuanoBiobio, Chile1 62.726 April27.92.2×
CauquenesMaule Region, Chile2 55.127 April25.12.2×

Daily means in µg/m³, over the days each city counted in this episode. Highest: its highest of those days. Usual: the city's median for the time of year of that day (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that, with a usual under 5 µg/m³ taken as 5.

Against other episodes in Chile

Number 26 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, Chile, April 2023: 9 cities with PM2.5 at twice their usual or more, 26 to 27 April 2023, smogrank.com/episodes/2023-04-chile (accessed 4 October 2026).

Download top 10 (PNG)

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.