Air quality in Brest, Brittany, France today

Mr. Duck’s Air Quality Score

Good air today for Brest, Brittany, France

⚠️ This website is currently under active development. Some data may be incomplete or temporarily inaccurate. For health-critical decisions, please verify information through official government or environmental sources.

Categories follow US EPA AQI breakpoints for PM (estimate from latest valid measurements; this project does not compute EPA NowCast/24-hour AQI yet).

This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.

Air quality today

The air quality in Brest today is classified as Good. The main pollutant identified is PM2.5, fine particulate matter that has been measured against a reference value of 1.6 µg/m³. In addition, the reference level for larger particles (PM10) is 3.0 µg/m³, based on seven valid measurements collected through OpenAQ.

Overall conditions meet the Good category criteria according to the latest data set. This page is informational; for health guidance, use official sources such as EPA AirNow or WHO.

Latest sensor values

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

What the data includes

The dataset for Brest includes measurements of nitrogen monoxide (NO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter ≤ 10 µm (PM10) and particulate matter ≤ 2.5 µg (PM2.5). In total 20 individual rows have been recorded across five monitoring stations, giving a modest spatial coverage of the city.

The most recent values are fairly fresh for most pollutants: NO₂, PM10, PM2.5 and O₃ were all last updated on 2026‑02‑10 at 15:00 UTC, while the latest NO reading dates from 2024‑03‑11 at 09:00 UTC. Across the dataset the newest timestamps fall within the past few days for four of the five pollutants, but NO data is older by more than a year, indicating an uneven temporal coverage.

Looking at the numbers themselves, the recorded concentrations span a wide range. NO₂ values vary from a minimum of 7.3 µg/m³ to a maximum of 18.0 µg/m³, with a median around 17.0 µg/m³, showing that most recent readings sit near the upper end of the observed spread. PM10 shows an even broader distribution, ranging from 3.0 µg/m³ up to 90.8 µg/m³ and a median of 17.2 µg/m³, suggesting occasional high‑dust events alongside typical background levels. O₃ concentrations are clustered between 53.6 µg/m³ and 74.5 µg/m³ with a median of 64.3 µg/m³, while PM2.5 stays low, from 1.6 µg/m³ to 13.2 µg/m³, median 8.0 µg/m³.

Overall the data set provides recent information for most pollutants but has limited depth for NO and a modest number of monitoring points, so conditions can differ across neighbourhoods and over time.

Learn more about sources and filtering: About the data.

Trusted references: WHO (Air pollution) · US EPA AirNow · European Environment Agency (Air)

Latest sensor values (bars)

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

Data notes

The current dataset for Brest includes seven valid measurements and is marked as Updated within 3 days, with the latest values recorded on 2026‑02‑10 at 15:00 UTC. This information reflects a single point in time; air quality can differ across neighborhoods and change throughout the day, so the figures shown may not represent conditions elsewhere in the city or later periods.

OpenAQ station rows