Worst air pollution San Fernando, today and tomorrow
Today (9 August): Air quality in San Fernando is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 PM (O3: 18.0/100).
Tomorrow (10 August 2026): Air quality in San Fernando is good. All pollutants stay as today. Pollution peaks around 6:00 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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San Fernando in Chile reflects the Chilean O'Higgins Region's Tinguiririca River valley position at 330 metres in the Central Valley, with vehicle traffic on surrounding roads and the wine, copper mining, and agricultural corridor contributing local sources. The Central Valley's topographic enclosure creates concentration under winter inversions, while Pacific westerlies provide seasonal relief and San Fernando generally maintains moderate Chilean central valley provincial readings throughout most of the year.
Today - 9 August | Pollution peaks at 20:00
AQI:
Good
18.0/100
PM2.5 (fine particles):
Good
12.3/100
PM10 (coarse particles):
Good
5.7/100
NO2 (nitrogen dioxide):
Good
0.1/100
O3 (ozone):
Good
18.0/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.2/100
PM1 (ultrafine particles):
Good
1.4/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 06:00
AQI:
Good
18.5/100
PM2.5 (fine particles):
Good
18.2/100
PM10 (coarse particles):
Good
8.3/100
NO2 (nitrogen dioxide):
Good
0.2/100
O3 (ozone):
Good
18.5/100
SO2 (sulfur dioxide):
Good
0.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.3/100
PM1 (ultrafine particles):
Good
2.2/100
Frequently Asked Questions
Is air quality bad in San Fernando right now?
On 9 August 2026, overall air quality in San Fernando is good. AQI is the main air quality indicator at 18.0/100. Pollution peaks around 8:00 PM (O3: 18.0/100).
Will air quality be worse tomorrow in San Fernando?
On 10 August 2026, air quality conditions in San Fernando will be similar to today, with AQI forecast at good at 18.5/100. Pollution peaks around 6:00 AM (O3: 18.5/100).
When is air pollution at its worst in San Fernando?
San Fernando usually sees its poorest air quality when traffic emissions, mining and quarrying operations, and crop farming coincide with periods when temperature inversions set in over the valley. The bowl-like terrain here limits how quickly pollutants can escape. This is most pronounced in winter, when inversions are more frequent.
Are air quality levels in San Fernando 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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