What is the air quality trend in Osan?

Over the past 3 days, Osan had an average AQI of 42 based on station measurements. The worst day was 2026-07-21 with AQI 45.

How is Osan air quality measured?

Air quality in Osan is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Osan, South Korea

Name: Osan Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Osan, South Korea.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

48h

PM2.5 Station

48h · 52 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	41	36–46	9.9 µg/m³	2h	66
2026-07-21	45	27–66	11.3 µg/m³	24h	116
2026-07-20	40	24–57	9.7 µg/m³	22h	99

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