Ulsan air quality now

South Korea · The summary is refreshed every 15 minutes.

November 12

The air is moderate now

Measured 06:00

Ulsan

6°C

Cloudy

66AQI

1026

hPa

Atmospheric
pressure

83%

Humidity

Ulsan, November 10, 2026: daily mean PM2.5 12 µg/m³ (20 sensors), level “Moderate” — as in the Atmy Data Hub. Now (07:00 local time): 16.9 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON

Right now in Ulsan, PM2.5 averages 16.9 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 20 sensors from Government stations, readings from 06:00–06:00 local time (21:00–21:00 UTC), summary prepared at 07:00 local time. Median: 16.0 µg/m³; range across sensors: 10.0–27.0 µg/m³.

In Ulsan the air is moderate 🟡 AQI 66. About the same as three hours ago. ☁️ +6 °C · No precipitation · Wind 2 m/s

In Ulsan the air is moderate right now (approximate, US EPA scale). From 18:00 to 07:00 local time the city mean PM2.5 stayed roughly level: from 16.0 to 16.9 µg/m³. The highest hour was 01:00 with 21.4 µg/m³.

Light wind (2 m/s) in the evening or at night, as the air cools, possibly traps particles near the ground (a temperature inversion).

Weather now: cloudy, 6°C, wind 2 m/s, humidity 83%. By 12:00 the wind is expected to pick up to 4 m/s, which may clear the air. By 18:00 the temperature will be about 14°C.

Written automatically at 07:00 local time (22:00 UTC) from sensor measurements and the weather forecast. Values are approximate; hypotheses are marked.

2 m/s

Wind, NW

0 mm

Precipitation today

Ulsan: air quality for the completed day

Metric: PM2.5, µg/m³ · Color scale: EPA AQI · November 10, 2026 · 00:00–24:00 UTC = 09:00–09:00 UTC+9

12 µg/m³ Moderate

Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 09:00–09:00 UTC+9): 12 µg/m³ from 20 sensors that passed the quality check — the same value as in the Atmy Data Hub.

No. 26 of 39 cities in South Korea and No. 479 of 676 worldwide, from the most polluted.

LowModerateElevatedHighVery highExtremely high

Pollution accumulation index now

38/100Moderate · An estimate of weather conditions · not a PM2.5 forecast

Now3840
07.0015.0022.0006.00

Pollution accumulation forecast

Today — November 12

18°/6°

Index by time of day

56/100Moderate

  1. 56/100Night
  2. 38/100Morning
  3. 9/100Day
  4. 24/100Evening

Friday — November 13

19°/6°

Index by time of day

55/100Moderate

  1. 55/100Night
  2. 41/100Morning
  3. 8/100Day
  4. 23/100Evening

Saturday — November 14

15°/10°

Index by time of day

57/100Moderate

  1. 57/100Night
  2. 40/100Morning
  3. 9/100Day
  4. 21/100Evening

Sunday — November 15

18°/12°

Index by time of day

47/100Moderate

  1. 47/100Night
  2. 36/100Morning
  3. 9/100Day
  4. 25/100Evening

Monday — November 16

15°/12°

Index by time of day

44/100Moderate

  1. 44/100Night
  2. 33/100Morning
  3. 7/100Day
  4. 23/100Evening

Tuesday — November 17

16°/10°

Index by time of day

49/100Moderate

  1. 49/100Night
  2. 37/100Morning
  3. 8/100Day
  4. 22/100Evening

Forecast of conditions that trap pollution near the surface

Weather

6°

Cloudy. Feels like 3°C

  1. MorningPartly cloudy9°C76%
  2. DayPartly cloudy18°C56%
  3. EveningPartly cloudy10°C93%

Wind

2m/sWind from the NW

4m/sWind gusts

Wind force: 2

Gusts up to 5 m/s are expected.

10-day weather forecast for Ulsan

South Korea

  1. TodayNov 12Cloudy18°C6°C
  2. FriNov 13Partly cloudy19°C6°C
  3. SatNov 14Rain15°C10°C
  4. SunNov 15Rain18°C12°C
  5. MonNov 16Cloudy15°C12°C
  6. TueNov 17Rain16°C10°C
  7. WedNov 18Rain16°C7°C
  8. ThuNov 19Partly cloudy8°C1°C
  9. FriNov 20Cloudy11°C-1°C
  10. SatNov 21Cloudy15°C-2°C

Where in Ulsan is the air worse?

See all sensors

Highest current reading: 27.0 µg/m³ (효문동 (한국환경공단 에어코리아 (AirKorea))). Lowest: 10.0 µg/m³ (신정로 (한국환경공단 에어코리아 (AirKorea))). The list shows every sensor, highest first.

  1. 효문동 (한국환경공단 에어코리아 (AirKorea)) →27 µg/m³
  2. 농소동 (한국환경공단 에어코리아 (AirKorea)) →22 µg/m³
  3. 웅촌면 (한국환경공단 에어코리아 (AirKorea)) →21 µg/m³
  4. 무거동 (한국환경공단 에어코리아 (AirKorea)) →19 µg/m³
  5. 약사동 (한국환경공단 에어코리아 (AirKorea)) →19 µg/m³
  6. 전하동 (한국환경공단 에어코리아 (AirKorea)) →18 µg/m³
  7. 범서읍 (한국환경공단 에어코리아 (AirKorea)) →18 µg/m³
  8. 선암동 (한국환경공단 에어코리아 (AirKorea)) →17 µg/m³
  9. 송정동 (한국환경공단 에어코리아 (AirKorea)) →17 µg/m³
  10. 방어진순환도로 (한국환경공단 에어코리아 (AirKorea)) →16 µg/m³
+10 more sensors
  1. 덕신리 (한국환경공단 에어코리아 (AirKorea)) →16 µg/m³
  2. 화산리 (한국환경공단 에어코리아 (AirKorea)) →16 µg/m³
  3. 성남동 (한국환경공단 에어코리아 (AirKorea)) →16 µg/m³
  4. 대송동 (한국환경공단 에어코리아 (AirKorea)) →16 µg/m³
  5. 부곡동(울산) (한국환경공단 에어코리아 (AirKorea)) →15 µg/m³
  6. 상남리 (한국환경공단 에어코리아 (AirKorea)) →15 µg/m³
  7. 신정동 (한국환경공단 에어코리아 (AirKorea)) →14 µg/m³
  8. 여천동(울산) (한국환경공단 에어코리아 (AirKorea)) →13 µg/m³
  9. 북부순환도로 (한국환경공단 에어코리아 (AirKorea)) →12 µg/m³
  10. 신정로 (한국환경공단 에어코리아 (AirKorea)) →10 µg/m³

Source: atmy.ai monitoring network

Who provides the data

Sensors in the summary by network: Government stations — 20 sensors.

Atmy shows the networks’ readings after the Data Hub’s quality check: test devices and sensors that fail it are left out.

South Korea: sensors in total

529

  1. SeoulSouth Korea

    34

  2. BusanSouth Korea

    30

  3. IncheonSouth Korea

    27

Cities with the most sensors

All sensors on the map, by city as the map assigns them; the city’s values count only the sensors that pass the Data Hub’s quality check.

Air quality calendar: Ulsan

Daily mean PM2.5 of the city sensors, µg/m³

Click a day to see its date and value.

LowModerateElevatedHighVery highExtremely high

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An Atmy card with the air quality in Ulsan now: it is refreshed every 15 minutes and links to this page. Paste the code into your site.

Air quality in Ulsan now — Atmy

South Korea · City ranking · All pilot cities

Questions

What was the air quality in Ulsan over the last completed day?

Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 09:00–09:00 UTC+9): 12 µg/m³ from 20 sensors that passed the quality check — the same value as in the Atmy Data Hub. No. 26 of 39 cities in South Korea and No. 479 of 676 worldwide, from the most polluted.

What is the air quality in Ulsan right now?

Right now in Ulsan, PM2.5 averages 16.9 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 20 sensors from Government stations, readings from 06:00–06:00 local time (21:00–21:00 UTC), summary prepared at 07:00 local time. Median: 16.0 µg/m³; range across sensors: 10.0–27.0 µg/m³.

Is it safe to be outdoors in Ulsan now?

The current level is “moderate” (US EPA scale, approximate). Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors. This is the standard guidance of the scale, not medical advice.

Where in Ulsan is the air worse?

Highest current reading: 27.0 µg/m³ (효문동 (한국환경공단 에어코리아 (AirKorea))). Lowest: 10.0 µg/m³ (신정로 (한국환경공단 에어코리아 (AirKorea))). The list shows every sensor, highest first.

Where do these data come from?

From Atmy sensors and connected public networks (citizen, experimental and government monitors), aggregated by Atmy. Values are approximate; see the methodology.

How often is this page updated?

The summary is rebuilt every 15 minutes from the latest reading of each sensor, each no older than one hour.

Data

Where do these data come from?

The daily value is the Data Hub’s: the mean of the city’s sensors that passed the nightly quality check, each with at least 12 valid hours, and only with sensors at four places 500 m apart; days are UTC.

“Now” uses the same sensors and rule: the mean of their latest readings, each at most 60 minutes old, shown only with sensors at four places 500 m apart reporting.

Source: public Atmy monitoring data. Methodology and data sources · Data terms