What is the air quality trend in Koch'ang?

Over the past 8 days, Koch'ang had an average AQI of 39 based on station measurements. The worst day was 2026-10-21 with AQI 52.

How is Koch'ang air quality measured?

Air quality in Koch'ang 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 Koch'ang, South Korea

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

Historical PM2.5 and AQI trend from monitoring stations near Koch'ang, 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 · 47 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	52	42–58	13.3 µg/m³	3h	25
2026-10-20	40	22–62	9.7 µg/m³	24h	37
2026-10-19	36	23–49	8.7 µg/m³	24h	45
2026-10-18	36	14–55	8.6 µg/m³	24h	35
2026-10-17	41	13–61	10.4 µg/m³	24h	35
2026-10-16	46	12–67	11.9 µg/m³	24h	44
2026-10-15	35	20–49	8.3 µg/m³	24h	43
2026-10-14	33	20–45	7.9 µg/m³	19h	43

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