Worst air pollution Santiago de Compostela, today and tomorrow
Today (9 August): Air quality in Santiago de Compostela is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 1:00 PM (O3: 33.2/100).
Tomorrow (10 August 2026): Air quality in Santiago de Compostela is fair. All pollutants stay as today. Pollution peaks around 7:00 PM (O3: 31.0/100). 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 de Compostela's air quality benefits from its Galician Atlantic position, with consistent wet westerly winds from the Atlantic providing reliable maritime ventilation across this UNESCO pilgrimage city. Vehicle traffic on the AG-54 motorway is the primary local source, while the surrounding Galician hills create topographic variation and the Atlantic coastal climate — Santiago is one of Spain's rainiest cities — provides exceptionally effective natural atmospheric washing throughout the year.
Today - 9 August | Pollution peaks at 13:00
AQI:
Fair
33.2/100
PM2.5 (fine particles):
Good
7.2/100
PM10 (coarse particles):
Good
5.1/100
NO2 (nitrogen dioxide):
Good
7.1/100
O3 (ozone):
Fair
33.2/100
SO2 (sulfur dioxide):
Good
0.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.3/100
PM1 (ultrafine particles):
Good
7.0/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 19:00
AQI:
Fair
31.0/100
PM2.5 (fine particles):
Good
9.2/100
PM10 (coarse particles):
Good
5.3/100
NO2 (nitrogen dioxide):
Good
8.6/100
O3 (ozone):
Fair
31.0/100
SO2 (sulfur dioxide):
Good
0.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.4/100
PM1 (ultrafine particles):
Good
5.9/100
Pollen forecast in Santiago de Compostela
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Santiago de Compostela
Frequently Asked Questions
Is air quality bad in Santiago de Compostela right now?
On 9 August 2026, overall air quality in Santiago de Compostela is fair. AQI is the main air quality indicator at 33.2/100. Pollution peaks around 1:00 PM (O3: 33.2/100).
Will air quality be worse tomorrow in Santiago de Compostela?
On 10 August 2026, air quality conditions in Santiago de Compostela will be similar to today, with AQI forecast at fair at 31.0/100. Pollution peaks around 7:00 PM (O3: 31.0/100).
When is air pollution at its worst in Santiago de Compostela?
How does air quality change throughout the year in Santiago de Compostela? The winter months typically bring the weakest air quality of the year, as calm anticyclonic conditions trap vehicle and heating pollution near the surface. Spring is typically a transitional season, as milder, windier weather starts clearing out the pollutants that accumulate during winter's calm spells. Summer readings are shaped mainly by ozone, which builds under strong sun and heat, sometimes worsened by drifting wildfire smoke. Autumn generally marks the shift back toward calmer, cleaner conditions as temperatures drop and rainfall becomes more regular. The Atlantic north's frequent rain and strong onshore winds generally keep year-round levels lower than in the drier interior and south.
Are air quality levels in Santiago de Compostela 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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