Fredrikstad Seasonal Pollution
Fredrikstad usually records its highest OpenAQ-derived EPA AQI in January and its cleanest month in July. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in Viken, Norway.
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Average EPA AQI
41
Rank 8 of 21 cities by average AQI
PM2.5
9.3
ug/m3 annualized city average
Seasonality
January
Cleanest: July
Health indicator
0.4
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Fredrikstad
92
46
47
32
36
28
21
29
36
38
45
42
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Fredrikstad, the current global analytics build covers 362 daily rows from 2024-01-03 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.