What is the air quality trend in Ulsan?

Over the past 8 days, Ulsan had an average AQI of 54 based on station measurements. The worst day was 2026-05-30 with AQI 65.

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.

105

Current AQI
Unhealthy for sensitive groups Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 33 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-30	65	55–74	18.7 µg/m³	9h	36
2026-05-29	62	52–76	17.1 µg/m³	24h	34
2026-05-28	54	30–93	15.0 µg/m³	24h	33
2026-05-27	34	29–45	8.3 µg/m³	24h	35
2026-05-26	51	16–110	13.3 µg/m³	24h	36
2026-05-25	56	23–67	14.6 µg/m³	24h	41
2026-05-24	59	26–75	16.4 µg/m³	24h	38
2026-05-23	55	43–61	14.3 µg/m³	13h	37

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