What is the air quality trend in Cheongju-si?

Over the past 3 days, Cheongju-si had an average AQI of 40 based on station measurements. The worst day was 2026-10-19 with AQI 40.

How is Cheongju-si air quality measured?

Air quality in Cheongju-si 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 Cheongju-si, South Korea

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

Historical PM2.5 and AQI trend from monitoring stations near Cheongju-si, South Korea.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

46h

PM2.5 Station

46h · 35 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	40	18–54	9.6 µg/m³	8h	31
2026-10-20	40	19–55	9.7 µg/m³	24h	28
2026-10-19	40	20–55	9.6 µg/m³	14h	36

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