Vantaa Seasonal Pollution
Vantaa usually records its highest OpenAQ-derived EPA AQI in March and its cleanest month in December. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in Uusimaa, Finland.
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Average EPA AQI
27
Rank 4 of 22 cities by average AQI
PM2.5
5.2
ug/m3 annualized city average
Seasonality
March
Cleanest: December
Health indicator
0.2
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Vantaa
32
29
35
26
33
29
29
29
35
21
18
17
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Vantaa, the current global analytics build covers 346 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.