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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

0501002024Calais

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.

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