Worst air pollution Chillán, today and tomorrow
Today (16 July): Air quality in Chillán is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 7:00 AM (O3: 15.2/100).
Tomorrow (17 July 2026): Air quality in Chillán is good. All pollutants stay as today. Pollution peaks around 11:00 PM (O3: 17.6/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Chillán's air quality reflects the Chilean Ñuble Region Chillán Viejo River valley position at 124 metres, with vehicle traffic on surrounding roads and the extraordinary residential wood-burning heating generating severe winter PM2.5 under frequent temperature inversions — Chillán having among Chile's highest wood fuel dependency. The surrounding Andean and Coastal Range topography creates valley enclosure, while Pacific westerlies provide seasonal relief and Chillán generally maintains among Chile's more persistently wood smoke-challenged urban environments throughout the winter months.
Today - 16 July | Pollution peaks at 07:00
AQI:
Good
15.2/100
PM2.5 (fine particles):
Good
7.7/100
PM10 (coarse particles):
Good
3.6/100
NO2 (nitrogen dioxide):
Good
0.0/100
O3 (ozone):
Good
15.2/100
SO2 (sulfur dioxide):
Good
0.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.2/100
PM1 (ultrafine particles):
Good
1.5/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 23:00
AQI:
Good
17.6/100
PM2.5 (fine particles):
Good
6.0/100
PM10 (coarse particles):
Good
2.9/100
NO2 (nitrogen dioxide):
Good
0.0/100
O3 (ozone):
Good
17.6/100
SO2 (sulfur dioxide):
Good
0.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.1/100
PM1 (ultrafine particles):
Good
0.9/100
Frequently Asked Questions
Is air quality bad in Chillán right now?
On 16 July 2026, overall air quality in Chillán is good. AQI is the main air quality indicator at 15.2/100. Pollution peaks around 7:00 AM (O3: 15.2/100).
Will air quality be worse tomorrow in Chillán?
On 17 July 2026, air quality conditions in Chillán will be similar to today, with AQI forecast at good at 17.6/100. Pollution peaks around 11:00 PM (O3: 17.6/100).
When is air pollution at its worst in Chillán?
The biggest local contributors to pollution in Chillán are traffic on the surrounding roads and residential biomass burning, particularly once the surrounding valley traps air close to the ground. Topographic enclosure in the valley lets pollution accumulate rather than clear out. Maritime airflow normally ventilates the area well, though calmer spells let levels rise.
Are air quality levels in Chillán based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app