What is the air quality trend in Osan?

Over the past 8 days, Osan had an average AQI of 55 based on station measurements. The worst day was 2026-05-30 with AQI 73.

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
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 113 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-30	73	60–86	22.7 µg/m³	9h	110
2026-05-29	63	53–87	17.7 µg/m³	24h	106
2026-05-28	55	31–82	15.0 µg/m³	24h	102
2026-05-27	35	29–42	8.3 µg/m³	24h	104
2026-05-26	49	24–67	12.4 µg/m³	24h	104
2026-05-25	57	34–65	15.1 µg/m³	24h	120
2026-05-24	59	33–67	16.0 µg/m³	24h	112
2026-05-23	56	52–60	14.5 µg/m³	13h	120

Back to Osan Air Quality