Worst air pollution San Cugat del Vallés, today and tomorrow
Today (9 August): Air quality in San Cugat del Vallés is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (O3: 35.9/100).
Tomorrow (10 August 2026): Air quality in San Cugat del Vallés is fair. All pollutants stay as today. Pollution peaks around 2:00 PM (O3: 35.7/100). Airmine updates local air quality forecasts four times daily.
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Sant Cugat del Vallès's air quality benefits from its elevated position in the Barcelona metropolitan area's Collserola park foothills at 124 metres, with vehicle traffic on the B-23 and surrounding technology campus and residential character contributing local sources. The Collserola hills filter northwesterly winds providing cleaner background air than the dense Eixample below, while the suburban character and green belt setting generally maintain better conditions than central Barcelona.
Today - 9 August | Pollution peaks at 15:00
AQI:
Fair
35.9/100
PM2.5 (fine particles):
Good
13.0/100
PM10 (coarse particles):
Good
4.2/100
NO2 (nitrogen dioxide):
Fair
28.9/100
O3 (ozone):
Fair
35.9/100
SO2 (sulfur dioxide):
Good
3.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
12.4/100
PM1 (ultrafine particles):
Good
13.8/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 14:00
AQI:
Fair
35.7/100
PM2.5 (fine particles):
Good
13.2/100
PM10 (coarse particles):
Good
4.0/100
NO2 (nitrogen dioxide):
Fair
24.5/100
O3 (ozone):
Fair
35.7/100
SO2 (sulfur dioxide):
Good
3.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.6/100
PM1 (ultrafine particles):
Good
15.9/100
Pollen forecast in San Cugat del Vallés
View pollen forecastFrequently Asked Questions
Is air quality bad in San Cugat del Vallés right now?
On 9 August 2026, overall air quality in San Cugat del Vallés is fair. AQI is the main air quality indicator at 35.9/100. Pollution peaks around 3:00 PM (O3: 35.9/100).
Will air quality be worse tomorrow in San Cugat del Vallés?
On 10 August 2026, air quality conditions in San Cugat del Vallés will be similar to today, with AQI forecast at fair at 35.7/100. Pollution peaks around 2:00 PM (O3: 35.7/100).
When is air pollution at its worst in San Cugat del Vallés?
How do the seasons affect air quality in San Cugat del Vallés? Winter mornings are frequently the year's most polluted, as fog and calm conditions trap traffic fumes and smoke from wood stoves close to the ground. Spring usually brings an improvement as more frequent rain and stronger winds help clear the air and wash out pollutants that built up over winter. Summer heat and intense sunlight drive photochemical ozone production, which can push afternoon air quality readings higher despite reduced winter-style pollution sources. The transition into autumn generally brings cleaner conditions, as more frequent rainfall and lower temperatures curb ozone formation. Sea breezes along this stretch of coast generally support air quality, but summer holiday traffic and occasional calima dust events can interrupt that.
Are air quality levels in San Cugat del Vallés 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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