Calais Seasonal Pollution
Calais usually records its highest OpenAQ-derived EPA AQI in November and its cleanest month in March. The page uses OpenAQ-derived daily history for 3 mapped monitoring locations in Hauts-de-France, France.
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Average EPA AQI
35
Rank 136 of 272 cities by average AQI
PM2.5
10.0
ug/m3 annualized city average
Seasonality
November
Cleanest: March
Health indicator
0.5
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Calais
18
14
14
22
47
31
39
38
33
41
52
48
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Calais, the current global analytics build covers 314 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.