Asan air quality now

South Korea · The summary is refreshed every 15 minutes.

November 12

The air is unhealthy for sensitive groups

Measured 06:00

Asan

4°C

Clear

111AQI

1027

hPa

Atmospheric
pressure

93%

Humidity

Asan, November 10, 2026: daily mean PM2.5 18 µg/m³ (5 sensors), level “Moderate” — as in the Atmy Data Hub. Now (07:00 local time): 39.6 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON

Right now in Asan, PM2.5 averages 39.6 µg/m³ — “unhealthy for sensitive groups” on the US EPA scale (approximate, from hourly readings). Mean of 5 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: 44.0 µg/m³; range across sensors: 15.0–51.0 µg/m³.

In Asan the air is unhealthy for sensitive groups 🟠 AQI 111. About the same as three hours ago. ☀️ +4 °C · No precipitation · Wind 3 m/s

In Asan the air is unhealthy for sensitive groups right now (approximate, US EPA scale). From 18:00 to 07:00 local time the city mean PM2.5 rose from 32.2 to 39.6 µg/m³. The highest hour was 23:00 with 46.6 µg/m³.

Cold weather (4°C) possibly means more heating, a common source of particles. High humidity (93%) possibly makes optical sensors read somewhat higher.

Weather now: clear, 4°C, wind 3 m/s, humidity 93%. No major change in the wind is expected in the coming hours. By 18:00 the temperature will be about 11°C.

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

3 m/s

Wind, SE

0 mm

Precipitation today

Asan: 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

18 µg/m³ Moderate

Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 09:00–09:00 UTC+9): 18 µg/m³ from 5 sensors that passed the quality check — the same value as in the Atmy Data Hub.

No. 6 of 39 cities in South Korea and No. 365 of 676 worldwide, from the most polluted.

LowModerateElevatedHighVery highExtremely high

Pollution accumulation index now

40/100Moderate · An estimate of weather conditions · not a PM2.5 forecast

Now4041
07.0015.0022.0006.00

Pollution accumulation forecast

Today — November 12

16°/4°

Index by time of day

53/100Moderate

  1. 53/100Night
  2. 40/100Morning
  3. 8/100Day
  4. 21/100Evening

Friday — November 13

18°/7°

Index by time of day

53/100Moderate

  1. 53/100Night
  2. 41/100Morning
  3. 10/100Day
  4. 23/100Evening

Saturday — November 14

14°/12°

Index by time of day

50/100Moderate

  1. 50/100Night
  2. 35/100Morning
  3. 9/100Day
  4. 21/100Evening

Sunday — November 15

17°/8°

Index by time of day

48/100Moderate

  1. 48/100Night
  2. 39/100Morning
  3. 9/100Day
  4. 28/100Evening

Monday — November 16

17°/7°

Index by time of day

56/100Moderate

  1. 56/100Night
  2. 32/100Morning
  3. 4/100Day
  4. 14/100Evening

Tuesday — November 17

15°/9°

Index by time of day

37/100Moderate

  1. 37/100Night
  2. 28/100Morning
  3. 7/100Day
  4. 22/100Evening

Forecast of conditions that trap pollution near the surface

Weather

4°

Clear. Feels like 1°C

  1. MorningClear8°C92%
  2. DayPartly cloudy16°C69%
  3. EveningPartly cloudy10°C93%

Wind

3m/sWind from the SE

2m/sWind gusts

Wind force: 2

Gusts up to 6 m/s are expected.

10-day weather forecast for Asan

South Korea

  1. TodayNov 12Partly cloudy16°C4°C
  2. FriNov 13Partly cloudy18°C7°C
  3. SatNov 14Rain14°C12°C
  4. SunNov 15Cloudy17°C8°C
  5. MonNov 16Cloudy17°C7°C
  6. TueNov 17Rain15°C9°C
  7. WedNov 18Rain10°C4°C
  8. ThuNov 19Cloudy5°C2°C
  9. FriNov 20Cloudy8°C1°C
  10. SatNov 21Cloudy13°C3°C

Where in Asan is the air worse?

See all sensors

Highest current reading: 51.0 µg/m³ (둔포면 (한국환경공단 에어코리아 (AirKorea))). Lowest: 15.0 µg/m³ (송악면 (한국환경공단 에어코리아 (AirKorea))). The list shows every sensor, highest first.

  1. 둔포면 (한국환경공단 에어코리아 (AirKorea)) →51 µg/m³
  2. 인주면 (한국환경공단 에어코리아 (AirKorea)) →50 µg/m³
  3. 장재리 (한국환경공단 에어코리아 (AirKorea)) →44 µg/m³
  4. 모종동 (한국환경공단 에어코리아 (AirKorea)) →38 µg/m³
  5. 송악면 (한국환경공단 에어코리아 (AirKorea)) →15 µg/m³

Source: atmy.ai monitoring network

Who provides the data

Sensors in the summary by network: Government stations — 5 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: Asan

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 Asan now: it is refreshed every 15 minutes and links to this page. Paste the code into your site.

Air quality in Asan now — Atmy

South Korea · City ranking · All pilot cities

Questions

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

Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 09:00–09:00 UTC+9): 18 µg/m³ from 5 sensors that passed the quality check — the same value as in the Atmy Data Hub. No. 6 of 39 cities in South Korea and No. 365 of 676 worldwide, from the most polluted.

What is the air quality in Asan right now?

Right now in Asan, PM2.5 averages 39.6 µg/m³ — “unhealthy for sensitive groups” on the US EPA scale (approximate, from hourly readings). Mean of 5 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: 44.0 µg/m³; range across sensors: 15.0–51.0 µg/m³.

Is it safe to be outdoors in Asan now?

The current level is “unhealthy for sensitive groups” (US EPA scale, approximate). Children, older adults and people with heart or lung disease should reduce prolonged or heavy exertion outdoors. This is the standard guidance of the scale, not medical advice.

Where in Asan is the air worse?

Highest current reading: 51.0 µg/m³ (둔포면 (한국환경공단 에어코리아 (AirKorea))). Lowest: 15.0 µg/m³ (송악면 (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