Worst air pollution Santiago, today and tomorrow
Today (9 August): Air quality in Santiago is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 PM (O3: 18.2/100).
Tomorrow (10 August 2026): Air quality in Santiago is good. All pollutants stay as today. Pollution peaks around 4:00 AM (O3: 18.5/100). 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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Santiago's air quality reflects the Central Valley's severe topographic trap at 567 metres, with the Andes to the east and the Coastal Range to the west creating near-complete basin enclosure that concentrates vehicle emissions from the Autopista Central and the extraordinary metropolitan vehicle density. The persistent anticyclonic inversion common to the Chilean Mediterranean climate makes Santiago one of South America's most challenging air quality environments, with winter inversion episodes creating some of the continent's most severe urban PM2.5 concentrations throughout the year.
Today - 9 August | Pollution peaks at 23:00
AQI:
Good
18.2/100
PM2.5 (fine particles):
Good
11.5/100
PM10 (coarse particles):
Good
5.3/100
NO2 (nitrogen dioxide):
Good
0.1/100
O3 (ozone):
Good
18.2/100
SO2 (sulfur dioxide):
Good
0.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.2/100
PM1 (ultrafine particles):
Good
1.3/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 04:00
AQI:
Good
18.5/100
PM2.5 (fine particles):
Good
16.4/100
PM10 (coarse particles):
Good
7.5/100
NO2 (nitrogen dioxide):
Good
0.2/100
O3 (ozone):
Good
18.5/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.3/100
PM1 (ultrafine particles):
Good
2.0/100
Frequently Asked Questions
Is air quality bad in Santiago right now?
On 9 August 2026, overall air quality in Santiago is good. AQI is the main air quality indicator at 18.2/100. Pollution peaks around 11:00 PM (O3: 18.2/100).
Will air quality be worse tomorrow in Santiago?
On 10 August 2026, air quality conditions in Santiago will be similar to today, with AQI forecast at good at 18.5/100. Pollution peaks around 4:00 AM (O3: 18.5/100).
When is air pollution at its worst in Santiago?
Santiago usually sees its poorest air quality when vehicle traffic coincides with periods when the surrounding valley traps air close to the ground. The bowl-like terrain here limits how quickly pollutants can escape. Sea breezes typically keep conditions in check, except during still weather.
Are air quality levels in Santiago 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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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