Westerland Seasonal Pollution
Westerland usually records its highest OpenAQ-derived EPA AQI in September and its cleanest month in April. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in Schleswig-Holstein, Germany.
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Average EPA AQI
28
Rank 243 of 297 cities by average AQI
PM2.5
7.7
ug/m3 annualized city average
Seasonality
September
Cleanest: April
Health indicator
0.3
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Westerland
14
14
19
11
15
39
25
37
46
37
38
44
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Westerland, the current global analytics build covers 315 daily rows from 2024-01-01 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.