Aarau Seasonal Pollution
Aarau usually records its highest OpenAQ-derived EPA AQI in December and its cleanest month in July. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Aargau, Switzerland.
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Average EPA AQI
65
Rank 2 of 33 cities by average AQI
PM2.5
17.8
ug/m3 annualized city average
Seasonality
December
Cleanest: July
Health indicator
0.8
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Aarau
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-
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54
58
62
59
74
75
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Aarau, the current global analytics build covers 163 daily rows from 2024-07-22 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.