Osan Seasonal Pollution
Osan usually records its highest OpenAQ-derived EPA AQI in April and its cleanest month in September. The page uses OpenAQ-derived daily history for 6 mapped monitoring locations in Gyeonggi, South Korea.
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Average EPA AQI
61
Rank 32 of 100 cities by average AQI
PM2.5
15.8
ug/m3 annualized city average
Seasonality
April
Cleanest: September
Health indicator
0.7
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Osan
-
-
70
79
62
66
44
60
41
56
64
70
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Osan, 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.