Seongnam air quality now

South Korea · The summary is refreshed every 15 minutes.

November 12

The air is moderate now

Measured 06:00

Seongnam

3°C

Cloudy

80AQI

1027

hPa

Atmospheric
pressure

100%

Humidity

Seongnam, November 10, 2026: daily mean PM2.5 13 µg/m³ (8 sensors), level “Moderate” — as in the Atmy Data Hub. Now (07:00 local time): 24.9 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON

Right now in Seongnam, PM2.5 averages 24.9 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 8 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: 26.0 µg/m³; range across sensors: 15.0–33.0 µg/m³.

In Seongnam the air is moderate 🟡 AQI 80. About the same as three hours ago. ☁️ +3 °C · No precipitation · Wind 2 m/s

In Seongnam the air is moderate right now (approximate, US EPA scale). From 18:00 to 07:00 local time the city mean PM2.5 rose from 18.6 to 24.9 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). Cold weather (3°C) possibly means more heating, a common source of particles.

Weather now: cloudy, 3°C, wind 2 m/s, humidity 100%. By 14:00 the wind is expected to pick up to 4 m/s, which may clear the air. By 18:00 the temperature will be about 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.

2 m/s

Wind, SSE

0 mm

Precipitation today

Seongnam: 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

13 µg/m³ Moderate

Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 09:00–09:00 UTC+9): 13 µg/m³ from 8 sensors that passed the quality check — the same value as in the Atmy Data Hub.

No. 24 of 39 cities in South Korea and No. 470 of 676 worldwide, from the most polluted.

LowModerateElevatedHighVery highExtremely high

Pollution accumulation index now

41/100Moderate · An estimate of weather conditions · not a PM2.5 forecast

Now4140
07.0015.0022.0006.00

Pollution accumulation forecast

Today — November 12

16°/3°

Index by time of day

53/100Moderate

  1. 53/100Night
  2. 41/100Morning
  3. 9/100Day
  4. 22/100Evening

Friday — November 13

17°/5°

Index by time of day

54/100Moderate

  1. 54/100Night
  2. 40/100Morning
  3. 10/100Day
  4. 23/100Evening

Saturday — November 14

13°/8°

Index by time of day

50/100Moderate

  1. 50/100Night
  2. 34/100Morning
  3. 7/100Day
  4. 17/100Evening

Sunday — November 15

17°/7°

Index by time of day

56/100Moderate

  1. 56/100Night
  2. 42/100Morning
  3. 9/100Day
  4. 26/100Evening

Monday — November 16

15°/6°

Index by time of day

55/100Moderate

  1. 55/100Night
  2. 37/100Morning
  3. 4/100Day
  4. 17/100Evening

Tuesday — November 17

14°/8°

Index by time of day

45/100Moderate

  1. 45/100Night
  2. 32/100Morning
  3. 6/100Day
  4. 24/100Evening

Forecast of conditions that trap pollution near the surface

Weather

3°

Cloudy. Feels like 0°C

  1. MorningPartly cloudy7°C94%
  2. DayPartly cloudy15°C72%
  3. EveningPartly cloudy9°C95%

Wind

2m/sWind from the SSE

3m/sWind gusts

Wind force: 2

Gusts up to 8 m/s are expected.

10-day weather forecast for Seongnam

South Korea

  1. TodayNov 12Cloudy16°C3°C
  2. FriNov 13Cloudy17°C5°C
  3. SatNov 14Rain13°C8°C
  4. SunNov 15Cloudy17°C7°C
  5. MonNov 16Cloudy15°C6°C
  6. TueNov 17Rain14°C8°C
  7. WedNov 18Rain10°C-1°C
  8. ThuNov 19Clear2°C-3°C
  9. FriNov 20Cloudy8°C-4°C
  10. SatNov 21Partly cloudy10°C3°C

Where in Seongnam is the air worse?

See all sensors

Highest current reading: 33.0 µg/m³ (성남대로(모란역) (한국환경공단 에어코리아 (AirKorea))). Lowest: 15.0 µg/m³ (운중동 (한국환경공단 에어코리아 (AirKorea))). The list shows every sensor, highest first.

  1. 성남대로(모란역) (한국환경공단 에어코리아 (AirKorea)) →33 µg/m³
  2. 복정동 (한국환경공단 에어코리아 (AirKorea)) →30 µg/m³
  3. 상대원동 (한국환경공단 에어코리아 (AirKorea)) →28 µg/m³
  4. 수내동 (한국환경공단 에어코리아 (AirKorea)) →27 µg/m³
  5. 단대동 (한국환경공단 에어코리아 (AirKorea)) →25 µg/m³
  6. 정자동 (한국환경공단 에어코리아 (AirKorea)) →22 µg/m³
  7. 대왕판교로(백현동) (한국환경공단 에어코리아 (AirKorea)) →19 µg/m³
  8. 운중동 (한국환경공단 에어코리아 (AirKorea)) →15 µg/m³

Source: atmy.ai monitoring network

Who provides the data

Sensors in the summary by network: Government stations — 8 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: Seongnam

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

Air quality in Seongnam now — Atmy

South Korea · City ranking · All pilot cities

Questions

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

Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 09:00–09:00 UTC+9): 13 µg/m³ from 8 sensors that passed the quality check — the same value as in the Atmy Data Hub. No. 24 of 39 cities in South Korea and No. 470 of 676 worldwide, from the most polluted.

What is the air quality in Seongnam right now?

Right now in Seongnam, PM2.5 averages 24.9 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 8 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: 26.0 µg/m³; range across sensors: 15.0–33.0 µg/m³.

Is it safe to be outdoors in Seongnam 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 Seongnam is the air worse?

Highest current reading: 33.0 µg/m³ (성남대로(모란역) (한국환경공단 에어코리아 (AirKorea))). Lowest: 15.0 µg/m³ (운중동 (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