Worst air pollution Irún, today and tomorrow
Today (20 September): Air quality in Irún is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 6:00 PM (O3: 22.9/100).
Tomorrow (21 September 2026): Air quality in Irún is fair. All pollutants stay as today. Pollution peaks around 5:00 PM (O3: 20.2/100). 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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Irún's air quality reflects the Bidasoa river estuary at the Spain-France border in the Basque Country, with vehicle traffic on the AP-8 motorway and the concentrated border crossing freight traffic generating elevated diesel NOₓ alongside the primary local sources. Atlantic westerlies from the Bay of Biscay provide reliable maritime ventilation, while the surrounding Cantabrian mountains and the Bidasoa valley create topographic variation and the border crossing freight intensity represents Irún's most distinctive local air quality influence.
Today - 20 September | Pollution peaks at 18:00
AQI:
Fair
22.9/100
PM2.5 (fine particles):
Good
9.3/100
PM10 (coarse particles):
Good
4.4/100
NO2 (nitrogen dioxide):
Good
16.8/100
O3 (ozone):
Fair
22.9/100
SO2 (sulfur dioxide):
Good
0.4/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
5.3/100
PM1 (ultrafine particles):
Good
3.9/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 17:00
AQI:
Fair
20.2/100
PM2.5 (fine particles):
Good
17.8/100
PM10 (coarse particles):
Good
10.1/100
NO2 (nitrogen dioxide):
Good
17.6/100
O3 (ozone):
Fair
20.2/100
SO2 (sulfur dioxide):
Good
0.6/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
5.3/100
PM1 (ultrafine particles):
Good
5.6/100
Pollen forecast in Irún
View pollen forecastFrequently Asked Questions
Is air quality bad in Irún right now?
On 20 September 2026, overall air quality in Irún is fair. AQI is the main air quality indicator at 22.9/100. Pollution peaks around 6:00 PM (O3: 22.9/100).
Will air quality be worse tomorrow in Irún?
On 21 September 2026, air quality conditions in Irún will be similar to today, with AQI forecast at fair at 20.2/100. Pollution peaks around 5:00 PM (O3: 20.2/100).
When is air pollution at its worst in Irún?
When is air quality typically worst in Irún? Winter high-pressure systems tend to produce the year's worst episodes, as still air traps traffic fumes and heating smoke at ground level. Conditions generally start to recover in spring, as increasing wind and rainfall break up the stagnant air masses typical of winter. Summer's combination of intense sun and high temperatures makes ozone the main concern, occasionally compounded by wildfire smoke during dry, windy spells. Autumn typically starts mild and can still see occasional ozone or dust episodes before rain and cooler temperatures gradually restore cleaner conditions. 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 Irún 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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