Worst air pollution Tarrasa, today and tomorrow
Today (20 September): Air quality in Tarrasa is fair. AQI, PM2.5, PM10, NO2, and O3 are fair; SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 PM (NO2: 36.3/100).
Tomorrow (21 September 2026): Air quality in Tarrasa is moderate. AQI worsens to moderate; NO2 increases to moderate; all other pollutants stay as today. Pollution peaks around 10:00 PM (NO2: 46.9/100). Airmine updates local air quality forecasts four times daily.
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Terrassa's air quality reflects its position in the Barcelona metropolitan area's Vallès Occidental industrial corridor, with vehicle traffic on the C-58 and AP-7 motorways and the surrounding textile, chemical, and automotive manufacturing industry contributing elevated NO₂ and PM2.5. The Collserola ridge to the southeast and the Prelitoral mountain range to the northeast create partial topographic enclosure, while the Vallès plain's typical sea breeze from Barcelona Bay provides afternoon ventilation relief during the summer months.
Today - 20 September | Pollution peaks at 22:00
AQI:
Fair
36.3/100
PM2.5 (fine particles):
Fair
32.9/100
PM10 (coarse particles):
Fair
22.7/100
NO2 (nitrogen dioxide):
Fair
36.3/100
O3 (ozone):
Fair
27.1/100
SO2 (sulfur dioxide):
Good
2.7/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
9.9/100
PM1 (ultrafine particles):
Good
18.6/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 22:00
AQI:
Moderate
46.9/100
PM2.5 (fine particles):
Fair
30.9/100
PM10 (coarse particles):
Fair
21.6/100
NO2 (nitrogen dioxide):
Moderate
46.9/100
O3 (ozone):
Fair
26.9/100
SO2 (sulfur dioxide):
Good
3.4/100
CO (carbon monoxide):
Good
0.8/100
HCHO (formaldehyde):
Good
10.6/100
PM1 (ultrafine particles):
Good
19.3/100
Pollen forecast in Tarrasa
View pollen forecastFrequently Asked Questions
Is air quality bad in Tarrasa right now?
On 20 September 2026, overall air quality in Tarrasa is fair. AQI is the main air quality indicator at 36.3/100. Pollution peaks around 10:00 PM (NO2: 36.3/100).
Will air quality be worse tomorrow in Tarrasa?
On 21 September 2026, air quality conditions in Tarrasa will be worse than today, with AQI forecast at moderate at 46.9/100. Pollution peaks around 10:00 PM (NO2: 46.9/100).
When is air pollution at its worst in Tarrasa?
What is the yearly air quality pattern like in Tarrasa? 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. March through May tends to see steady improvement, with more unsettled weather patterns helping disperse traffic and heating pollution. Summer brings its own challenge in the form of ground-level ozone, which forms readily under strong sunshine and high temperatures, particularly during heatwaves. Conditions tend to stabilise in autumn, as cooling weather and increasing rain reduce the ozone spikes typical of summer. The mild, breezy Mediterranean climate generally supports good dispersal, though summer crowds and Saharan dust intrusions can occasionally push levels higher.
Are air quality levels in Tarrasa 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: 20 September 2026 at 14:33 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.
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.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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