Saint-Denis Seasonal Pollution
Saint-Denis usually records its highest OpenAQ-derived EPA AQI in December and its cleanest month in August. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in Ile-de-France, France.
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Average EPA AQI
58
Rank 3 of 272 cities by average AQI
PM2.5
13.9
ug/m3 annualized city average
Seasonality
December
Cleanest: August
Health indicator
0.6
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Saint-Denis
67
51
54
-
-
51
53
51
58
61
68
68
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Saint-Denis, the current global analytics build covers 200 daily rows from 2024-01-02 to 2024-12-30. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.