Worst air pollution Bilbao, today and tomorrow
Today (9 August): Air quality in Bilbao is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 2:00 PM (O3: 34.6/100).
Tomorrow (10 August 2026): Air quality in Bilbao is fair. All pollutants stay as today. Pollution peaks around 5:00 PM (O3: 31.1/100). 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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Bilbao's air quality has improved dramatically since the industrial era but remains influenced by the Nervión valley's enclosed topography, with the surrounding Cantabrian mountains limiting dispersal on calm days. Atlantic westerlies from the Bay of Biscay provide the primary natural ventilation, while vehicle traffic and remaining industrial activity in the lower valley are the primary local emission sources.
Today - 9 August | Pollution peaks at 14:00
AQI:
Fair
34.6/100
PM2.5 (fine particles):
Good
4.8/100
PM10 (coarse particles):
Good
1.6/100
NO2 (nitrogen dioxide):
Good
3.2/100
O3 (ozone):
Fair
34.6/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.5/100
PM1 (ultrafine particles):
Good
5.7/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 17:00
AQI:
Fair
31.1/100
PM2.5 (fine particles):
Good
5.4/100
PM10 (coarse particles):
Good
2.8/100
NO2 (nitrogen dioxide):
Good
4.3/100
O3 (ozone):
Fair
31.1/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.2/100
PM1 (ultrafine particles):
Good
4.5/100
Pollen forecast in Bilbao
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Frequently Asked Questions
Is air quality bad in Bilbao right now?
On 9 August 2026, overall air quality in Bilbao is fair. AQI is the main air quality indicator at 34.6/100. Pollution peaks around 2:00 PM (O3: 34.6/100).
Will air quality be worse tomorrow in Bilbao?
On 10 August 2026, air quality conditions in Bilbao will be similar to today, with AQI forecast at fair at 31.1/100. Pollution peaks around 5:00 PM (O3: 31.1/100).
When is air pollution at its worst in Bilbao?
What is the yearly air quality pattern like in Bilbao? Winter tends to bring the year's weakest readings, as stagnant, cold air lets heating smoke and vehicle emissions build up rather than clear away. 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's intense heat and sunshine create ideal conditions for ozone formation, sometimes overshadowing the lower traffic volumes typical of the season. Autumn usually sees a steady return to cleaner conditions as the ozone-favouring heat of summer fades and rainfall picks up. Being close to the Atlantic, this area benefits from regular rainfall and wind that help keep pollution from building up for long.
Are air quality levels in Bilbao 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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