Oulu Seasonal Pollution
Oulu usually records its highest OpenAQ-derived EPA AQI in August and its cleanest month in November. The page uses OpenAQ-derived daily history for 3 mapped monitoring locations in Pohjois-Pohjanmaa, Finland.
Search city analytics
Average EPA AQI
23
Rank 11 of 22 cities by average AQI
PM2.5
4.2
ug/m3 annualized city average
Seasonality
August
Cleanest: November
Health indicator
0.2
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Oulu
26
28
21
22
28
24
25
28
17
19
16
18
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Oulu, 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.