What is the air quality trend in Koesan?

Over the past 8 days, Koesan had an average AQI of 52 based on station measurements. The worst day was 2026-08-08 with AQI 58.

How is Koesan air quality measured?

Air quality in Koesan 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 Koesan, South Korea

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

163h

PM2.5 Station

163h · 8 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-08-08	58	27–188	27.6 µg/m³	6h	10
2026-08-07	48	20–64	12.1 µg/m³	21h	13
2026-08-06	48	18–64	11.9 µg/m³	24h	29
2026-08-05	49	16–86	12.4 µg/m³	24h	29
2026-08-04	55	33–74	14.7 µg/m³	24h	20
2026-08-03	56	38–67	14.9 µg/m³	24h	15
2026-08-02	51	27–66	13.1 µg/m³	24h	10
2026-08-01	52	22–68	13.8 µg/m³	16h	10

Back to Koesan Air Quality