Worst air pollution Lorient, today and tomorrow
Today (9 August): Air quality in Lorient 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: 37.8/100).
Tomorrow (10 August 2026): Air quality in Lorient is fair. All pollutants stay as today. Pollution peaks around 7:00 PM (O3: 24.8/100). Airmine updates local air quality forecasts four times daily.
Get the full experience in the Airmine app.
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Follow your pollen exposure and performance with the free Airmine–Strava integration. See your pollen and air quality exposure for every Strava activity.
Lorient's air quality benefits from its exceptional Atlantic and Biscay Bay coastal position in Brittany, with consistent and powerful Atlantic westerlies providing reliable maritime ventilation. Vehicle traffic on the N165 and the French naval base operations contribute local sources, while the outstanding Atlantic coastal exposure and the Scorff-Blavet estuary's open geometry generally maintain Lorient among France's cleaner major coastal urban environments throughout most of the year.
Today - 9 August | Pollution peaks at 14:00
AQI:
Fair
37.8/100
PM2.5 (fine particles):
Good
9.0/100
PM10 (coarse particles):
Good
7.0/100
NO2 (nitrogen dioxide):
Good
8.2/100
O3 (ozone):
Fair
37.8/100
SO2 (sulfur dioxide):
Good
1.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.3/100
PM1 (ultrafine particles):
Good
4.6/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 19:00
AQI:
Fair
24.8/100
PM2.5 (fine particles):
Good
4.8/100
PM10 (coarse particles):
Good
3.2/100
NO2 (nitrogen dioxide):
Good
3.7/100
O3 (ozone):
Fair
24.8/100
SO2 (sulfur dioxide):
Good
0.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.8/100
PM1 (ultrafine particles):
Good
3.4/100
Pollen forecast in Lorient
View pollen forecastSports venues in Lorient
Frequently Asked Questions
Is air quality bad in Lorient right now?
On 9 August 2026, overall air quality in Lorient is fair. AQI is the main air quality indicator at 37.8/100. Pollution peaks around 2:00 PM (O3: 37.8/100).
Will air quality be worse tomorrow in Lorient?
On 10 August 2026, air quality conditions in Lorient will be similar to today, with AQI forecast at fair at 24.8/100. Pollution peaks around 7:00 PM (O3: 24.8/100).
When is air pollution at its worst in Lorient?
The days that hit sensitive groups hardest in Lorient are calm spring ones, when fishing-port and coastal traffic and the birch and oak pollen peak overlap; Atlantic sea breezes ventilate the coast reliably, so relief usually isn't far behind. The presence of Breton dairy pasture and coastal farmland in the area adds another layer to the local pattern.
Are air quality levels in Lorient 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.
Want to see air quality forecasts for other cities in France?
Check air quality in other popular cities:
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.
Get the full experience in the Airmine app.