Hennef Seasonal Pollution
Hennef usually records its highest OpenAQ-derived EPA AQI in October and its cleanest month in December. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in North Rhine-Westphalia, Germany.
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Average EPA AQI
47
Rank 30 of 297 cities by average AQI
PM2.5
14.1
ug/m3 annualized city average
Seasonality
October
Cleanest: December
Health indicator
0.6
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Hennef
-
-
-
-
60
54
35
35
60
194
54
21
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Hennef, the current global analytics build covers 190 daily rows from 2024-05-10 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.