Celje Seasonal Pollution
Celje usually records its highest OpenAQ-derived EPA AQI in December and its cleanest month in October. The page uses OpenAQ-derived daily history for 4 mapped monitoring locations in Celje, Slovenia.
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Average EPA AQI
48
Rank 5 of 17 cities by average AQI
PM2.5
14.7
ug/m3 annualized city average
Seasonality
December
Cleanest: October
Health indicator
0.7
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Celje
39
31
32
48
40
41
47
43
36
30
90
95
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Celje, 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.