Vaasa Seasonal Pollution
Vaasa usually records its highest OpenAQ-derived EPA AQI in June and its cleanest month in November. The page uses OpenAQ-derived daily history for 4 mapped monitoring locations in Pohjanmaa, Finland.
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Average EPA AQI
10
Rank 15 of 22 cities by average AQI
PM2.5
4.6
ug/m3 annualized city average
Seasonality
June
Cleanest: November
Health indicator
0.2
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Vaasa
11
5
13
18
11
21
8
9
10
5
4
7
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Vaasa, the current global analytics build covers 329 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.