Krefeld Seasonal Pollution
Krefeld usually records its highest OpenAQ-derived EPA AQI in March and its cleanest month in April. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in North Rhine-Westphalia, Germany.
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Average EPA AQI
48
Rank 20 of 297 cities by average AQI
PM2.5
10.7
ug/m3 annualized city average
Seasonality
March
Cleanest: April
Health indicator
0.5
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Krefeld
56
43
61
41
53
50
44
55
43
43
47
45
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Krefeld, the current global analytics build covers 327 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.