Worst air pollution San Fernando, today and tomorrow
Today (16 July): Air quality in San Fernando is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 PM (O3: 12.1/100).
Tomorrow (17 July 2026): Air quality in San Fernando is good. All pollutants stay as today. Pollution peaks around 11:00 PM (O3: 16.9/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
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 - 16 July | Pollution peaks at 23:00
AQI:
Good
12.1/100
PM2.5 (fine particles):
Good
11.3/100
PM10 (coarse particles):
Good
5.3/100
NO2 (nitrogen dioxide):
Good
0.4/100
O3 (ozone):
Good
12.1/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.3/100
PM1 (ultrafine particles):
Good
2.1/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 23:00
AQI:
Good
16.9/100
PM2.5 (fine particles):
Good
11.2/100
PM10 (coarse particles):
Good
5.2/100
NO2 (nitrogen dioxide):
Good
0.5/100
O3 (ozone):
Good
16.9/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.4/100
PM1 (ultrafine particles):
Good
2.1/100
Frequently Asked Questions
Is air quality bad in San Fernando right now?
On 16 July 2026, overall air quality in San Fernando is good. AQI is the main air quality indicator at 12.1/100. Pollution peaks around 11:00 PM (O3: 12.1/100).
Will air quality be worse tomorrow in San Fernando?
On 17 July 2026, air quality conditions in San Fernando will be similar to today, with AQI forecast at good at 16.9/100. Pollution peaks around 11:00 PM (O3: 16.9/100).
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.
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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