What is the air quality trend in Sejong?

Over the past 7 days, Sejong had an average AQI of 51 based on station measurements. The worst day was 2026-08-03 with AQI 54.

How is Sejong air quality measured?

Air quality in Sejong 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 Sejong, South Korea

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

162h

PM2.5 Station

162h · 21 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-08-07	53	33–91	13.9 µg/m³	20h	28
2026-08-06	50	27–66	12.9 µg/m³	24h	52
2026-08-05	51	36–71	12.7 µg/m³	24h	52
2026-08-04	52	30–76	13.6 µg/m³	24h	36
2026-08-03	54	35–64	13.7 µg/m³	24h	27
2026-08-02	50	30–60	12.4 µg/m³	24h	20
2026-08-01	52	29–62	13.5 µg/m³	22h	20

Back to Sejong Air Quality