What is the air quality trend in Ulsan?

Over the past 7 days, Ulsan had an average AQI of 43 based on station measurements. The worst day was with AQI .

How is Ulsan air quality measured?

Air quality in Ulsan 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 Ulsan, South Korea

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

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

Current AQI
Good

48 Hours 7 Days 14 Days 20 Days

PM2.5 Trend

103h · 1 station

Daily Summary

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-04-11	40	38–43	9.7 µg/m³	4h	1
2026-04-10	33	28–43	8.0 µg/m³	24h	1
2026-04-09	46	30–58	11.4 µg/m³	16h	1
2026-04-08	67	59–77	19.7 µg/m³	8h	1
2026-04-07	46	29–61	11.6 µg/m³	24h	1
2026-04-06	46	27–64	11.7 µg/m³	18h	1
2026-04-04	23	12–47	5.5 µg/m³	9h	1

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