Worst air pollution Brest, today and tomorrow
Today (16 July): Air quality in Brest is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 2:00 PM (O3: 50.9/100).
Tomorrow (17 July 2026): Air quality in Brest is fair. AQI worsens to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 3:00 PM (O3: 39.8/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Brest's air quality benefits from its exceptional Atlantic Ocean exposure on the westernmost tip of the Breton peninsula, with some of Europe's most consistent and powerful Atlantic westerly winds providing outstanding natural ventilation throughout most of the year. Vehicle traffic on the surrounding road network is the primary local source, while the French naval base and Brest Arsenal's military shipping contribute maritime NOₓ around the Rade de Brest harbour, and the remarkable Atlantic exposure generally makes Brest one of France's cleanest major urban environments on most days.
Today - 16 July | Pollution peaks at 14:00
AQI:
Medium
50.9/100
PM2.5 (fine particles):
Good
9.1/100
PM10 (coarse particles):
Good
3.0/100
NO2 (nitrogen dioxide):
Good
16.8/100
O3 (ozone):
Medium
50.9/100
SO2 (sulfur dioxide):
Good
1.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.0/100
PM1 (ultrafine particles):
Good
11.0/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 15:00
AQI:
Fair
39.8/100
PM2.5 (fine particles):
Good
6.8/100
PM10 (coarse particles):
Good
2.1/100
NO2 (nitrogen dioxide):
Good
14.7/100
O3 (ozone):
Fair
39.8/100
SO2 (sulfur dioxide):
Good
1.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.0/100
PM1 (ultrafine particles):
Good
8.4/100
Pollen forecast in Brest
View pollen forecastFrequently Asked Questions
Is air quality bad in Brest right now?
On 16 July 2026, overall air quality in Brest is medium. AQI is the main air quality indicator at 50.9/100. Pollution peaks around 2:00 PM (O3: 50.9/100).
Will air quality be worse tomorrow in Brest?
On 17 July 2026, air quality conditions in Brest will be worse than today, with AQI forecast at fair at 39.8/100. Pollution peaks around 3:00 PM (O3: 39.8/100).
When is air pollution at its worst in Brest?
In Brest, the worst combined pollen and air quality days tend to come when fishing-port and coastal traffic coincide with the peak birch and oak pollen season in spring; Atlantic sea breezes ventilate the coast reliably, so conditions usually improve within a day or two. Nearby Breton dairy pasture and coastal farmland add a further seasonal factor.
Are air quality levels in Brest 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.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app