Winterthur Seasonal Pollution
Winterthur usually records its highest OpenAQ-derived EPA AQI in December and its cleanest month in May. The page uses OpenAQ-derived daily history for 3 mapped monitoring locations in Zurich, Switzerland.
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Average EPA AQI
33
Rank 17 of 33 cities by average AQI
PM2.5
16.8
ug/m3 annualized city average
Seasonality
December
Cleanest: May
Health indicator
0.8
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Winterthur
12
8
11
-
6
10
8
8
41
56
70
73
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Winterthur, the current global analytics build covers 245 daily rows from 2024-01-29 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.