Ulsan: Air Pollution Today — AQI Index, PM2.5/PM10, Smog Alerts and Forecast

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Latest air quality data: Ulsan

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Pollution and air quality forecast for Ulsan. Today is Thursday, August 27, 2026. The following air pollution values have been recorded for Ulsan:

particulate matter (PM2.5) dust - 9 (Good)
particulate matter (PM10) suspended dust - 9 (Good)
ozone (O3) - 80 (Moderate)
nitrogen dioxide (NO2) - 26 (Good)
sulfur dioxide (SO2) - 14 (Good)
carbon monoxide (CO) - 148 (Good)

Real-time Air Quality Index (AQI) for Ulsan, Thursday, August 27, 2026: 2.

AQI 2 Moderate

What is the air quality in Ulsan today? Is the air polluted in Ulsan?. Is there smog?

Today (Thursday, August 27, 2026) air quality is moderate in Ulsan. Some pollutants in Ulsan may slightly affect very few hypersensitive individuals. Air pollutants in Ulsan may cause minor breathing discomfort to sensitive people.

What is the current level of PM2.5 in Ulsan? (particulate matter (PM2.5) dust)
Today's PM2.5 level is: 9 (Good) For comparison, the highest level of PM2.5 in Ulsan in the last 7 days was: 30 (Monday, August 24, 2026) and the lowest: 12 (Thursday, August 27, 2026).

What is the level of PM10 today in Ulsan? (particulate matter (PM10) suspended dust)
The current level of particulate matter PM10 in Ulsan is: 9 (Good)

How is the O3 level today in Ulsan? (ozone (O3))
80 (Moderate)

How high is the level of NO2? (nitrogen dioxide (NO2))
26 (Good)

What is the level of SO2 pollution? (sulfur dioxide (SO2))
14 (Good)

How high is the CO level? (carbon monoxide (CO))
148 (Good)

Current data Thursday, August 27, 2026 at 10:00 AM

PM2,5 9 (Good)

PM10 9 (Good)

O3 80 (Moderate)

NO2 26 (Good)

SO2 14 (Good)

CO 148 (Good)

Data on air pollution from recent days in Ulsan

index	2026-08-27	2026-08-26	2026-08-25	2026-08-24	2026-08-23	2026-08-22	2026-08-21	2026-08-20
pm25	12 Good	28 Moderate	27 Moderate	30 Moderate	25 Moderate	15 Moderate	16 Moderate	16 Moderate
pm10	12 Good	29 Moderate	28 Moderate	31 Moderate	26 Moderate	19 Good	17 Good	17 Good
o3	34 Good	70 Moderate	64 Good	72 Moderate	85 Moderate	59 Good	54 Good	59 Good
no2	42 Moderate	50 Moderate	51 Moderate	40 Moderate	39 Good	37 Good	49 Moderate	41 Moderate
so2	13 Good	20 Good	15 Good	16 Good	17 Good	10 Good	17 Good	13 Good
co	268 Good	287 Good	297 Good	269 Good	218 Good	354 Good	519 Good	423 Good

data source »

Ulsan

Thursday, August 27, 2026 at 10:00 AM

PM2,5 8.6 (Good)

particulate matter (PM2.5) dust

PM10 9.2 (Good)

particulate matter (PM10) suspended dust

O3 80 (Moderate)

ozone (O3)

NO2 26 (Good)

nitrogen dioxide (NO2)

SO2 14 (Good)

sulfur dioxide (SO2)

CO 148 (Good)

carbon monoxide (CO)

Ulsan

index	2026-08-20	2026-08-21	2026-08-22	2026-08-23	2026-08-24	2026-08-25	2026-08-26	2026-08-27
pm25	16	16	15	25	30	27	28	12
pm10	17	17	19	26	31	28	29	12
o3	59	54	59	85	72	64	70	34
no2	41	49	37	39	40	51	50	42
so2	13	17	9.8	17	16	15	20	13
co	423	519	354	218	269	297	287	268

* Pollution data source: https://openaq.org () The data is licensed under CC-By 4.0

🌦️ Weather · 16-day Forecast — Ulsan

16-day weather forecast for Ulsan: today around 34°C (rain), lows near 25°C. Daily temperature and conditions, updated every day. A moderate breeze (about 14 km/h) is partially dispersing pollutants today.

☀️ UV Index · 16-day Forecast — Ulsan

The UV index in Ulsan today is 7.2 (high) — unprotected fair skin can burn in about 30 minutes.

📍 Air quality in nearby cities

Live PM2.5 around Ulsan — compare nearby locations.

Busan 8 µg/m³
Pohang 9 µg/m³
Changwon 7 µg/m³
Daegu 12 µg/m³
Daejeon 28 µg/m³
Jeonju 26 µg/m³
Seoul 12 µg/m³
Incheon 12 µg/m³

Frequently asked questions

Is the air safe to breathe in Ulsan today?

The current average PM2.5 across Ulsan is about 9 µg/m³, rated “Good”. Air quality is good — outdoor activities are fine for everyone.

What is the current PM2.5 level in Ulsan?

Right now PM2.5 in Ulsan averages about 9 µg/m³ (“Good”). PM2.5 are fine particles small enough to reach the lungs and bloodstream.

Which day last week had the worst air in Ulsan?

Over the past week, the highest daily PM2.5 in Ulsan was recorded on Monday, August 24 (about 30 µg/m³).

What is the UV index in Ulsan today?

The UV index in Ulsan today is 7.2 (high) — unprotected fair skin can burn in about 30 minutes.

Does today's wind help disperse smog in Ulsan?

A moderate breeze (about 14 km/h) is partially dispersing pollutants today.

How is air quality measured?

Air quality here is based on PM2.5 — the concentration of fine particulate matter in µg/m³. Lower values mean cleaner air. Data is updated daily from Open-Meteo.