Dej Seasonal Pollution
Dej usually records its highest OpenAQ-derived EPA AQI in February and its cleanest month in May. The page uses OpenAQ-derived daily history for 3 mapped monitoring locations in Cluj, Romania.
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Average EPA AQI
74
Rank 3 of 69 cities by average AQI
PM2.5
22.8
ug/m3 annualized city average
Seasonality
February
Cleanest: May
Health indicator
1.0
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Dej
111
116
80
51
35
41
46
43
49
81
112
113
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Dej, the current global analytics build covers 333 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.