Sundsvall Seasonal Pollution
Sundsvall usually records its highest OpenAQ-derived EPA AQI in May and its cleanest month in November. The page uses OpenAQ-derived daily history for 5 mapped monitoring locations in Västernorrland, Sweden.
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Average EPA AQI
27
Rank 14 of 31 cities by average AQI
PM2.5
5.1
ug/m3 annualized city average
Seasonality
May
Cleanest: November
Health indicator
0.2
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Sundsvall
16
21
38
36
40
34
24
28
32
23
15
19
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Sundsvall, the current global analytics build covers 340 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.