Sejong Seasonal Pollution
Sejong usually records its highest OpenAQ-derived EPA AQI in April and its cleanest month in July. The page uses OpenAQ-derived daily history for 7 mapped monitoring locations in Sejong, South Korea.
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Average EPA AQI
57
Rank 53 of 100 cities by average AQI
PM2.5
13.9
ug/m3 annualized city average
Seasonality
April
Cleanest: July
Health indicator
0.6
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Sejong
-
-
66
70
60
63
43
56
43
52
61
65
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Sejong, the current global analytics build covers 286 daily rows from 2024-03-20 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.