Brest Seasonal Pollution
Brest usually records its highest OpenAQ-derived EPA AQI in January and its cleanest month in March. The page uses OpenAQ-derived daily history for 4 mapped monitoring locations in Bretagne, France.
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Average EPA AQI
40
Rank 69 of 272 cities by average AQI
PM2.5
7.9
ug/m3 annualized city average
Seasonality
January
Cleanest: March
Health indicator
0.4
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Brest
49
34
27
39
39
38
34
37
48
39
47
43
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Brest, the current global analytics build covers 329 daily rows from 2024-01-02 to 2024-12-31. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.