Koper Seasonal Pollution
Koper usually records its highest OpenAQ-derived EPA AQI in November and its cleanest month in October. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in Koper, Slovenia.
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Average EPA AQI
33
Rank 15 of 17 cities by average AQI
PM2.5
9.9
ug/m3 annualized city average
Seasonality
November
Cleanest: October
Health indicator
0.4
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Koper
23
22
22
38
35
39
43
36
23
15
56
47
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Koper, the current global analytics build covers 360 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.