What is the air quality trend in Seoul?

Over the past 16 days, Seoul had an average AQI of 56 based on station measurements. The worst day was with AQI .

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
Moderate

48 Hours 7 Days 14 Days 20 Days

PM2.5 Trend

297h · 1 station

Daily Summary

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-04-10	61	38–70	17.1 µg/m³	20h	1
2026-04-09	36	32–42	8.8 µg/m³	16h	1
2026-04-08	53	52–54	13.1 µg/m³	8h	1
2026-04-07	31	18–52	7.3 µg/m³	24h	1
2026-04-06	20	12–48	4.8 µg/m³	18h	1
2026-04-04	51	44–61	12.6 µg/m³	14h	1
2026-04-03	58	37–85	16.1 µg/m³	24h	1
2026-04-02	74	56–97	22.8 µg/m³	21h	1
2026-04-01	60	41–70	16.7 µg/m³	21h	1
2026-03-31	25	16–56	5.9 µg/m³	21h	1
2026-03-30	66	61–70	19.0 µg/m³	10h	1
2026-03-29	60	57–69	16.6 µg/m³	23h	1
2026-03-28	70	66–86	21.1 µg/m³	22h	1
2026-03-27	81	64–102	26.6 µg/m³	24h	1
2026-03-26	78	65–107	24.8 µg/m³	24h	1
2026-03-25	73	70–74	22.3 µg/m³	7h	1

Back to Seoul Air Quality