What is the air quality trend in Seoul?

Over the past 7 days, Seoul had an average AQI of 48 based on station measurements. The worst day was 2026-07-17 with AQI 56.

How is Seoul air quality measured?

Air quality in Seoul 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 Seoul, South Korea

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

168h

PM2.5 Station

168h · 47 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	45	23–70	11.2 µg/m³	24h	117
2026-07-20	41	33–55	9.8 µg/m³	24h	100
2026-07-19	47	24–59	11.4 µg/m³	24h	94
2026-07-18	46	28–60	11.2 µg/m³	24h	91
2026-07-17	56	34–71	14.8 µg/m³	24h	70
2026-07-16	55	30–75	14.9 µg/m³	24h	68
2026-07-15	51	28–59	12.8 µg/m³	24h	49

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