Chartres Seasonal Pollution
Chartres usually records its highest OpenAQ-derived EPA AQI in January and its cleanest month in April. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in Centre-Val de Loire, France.
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Average EPA AQI
35
Rank 135 of 272 cities by average AQI
PM2.5
7.1
ug/m3 annualized city average
Seasonality
January
Cleanest: April
Health indicator
0.3
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Chartres
55
36
30
26
30
32
27
30
34
33
45
42
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Chartres, the current global analytics build covers 332 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.