Castres Seasonal Pollution
Castres usually records its highest OpenAQ-derived EPA AQI in January and its cleanest month in May. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in Occitanie, France.
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Average EPA AQI
40
Rank 71 of 272 cities by average AQI
PM2.5
8.7
ug/m3 annualized city average
Seasonality
January
Cleanest: May
Health indicator
0.4
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Castres
66
46
29
28
22
30
33
36
30
27
51
60
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Castres, the current global analytics build covers 304 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.