South Korea · The summary is refreshed every 15 minutes.
November 12
The air is moderate now
Measured 06:00–06:47
Seoul
6°C
Partly cloudy
1027
hPaAtmospheric
pressure
97%
Humidity
Seoul, November 10, 2026: daily mean PM2.5 16 µg/m³ (35 sensors), level “Moderate” — as in the Atmy Data Hub. Now (07:00 local time): 31.9 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON
Right now in Seoul, PM2.5 averages 31.9 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 34 sensors from Government stations, AirGradient, readings from 06:00–06:47 local time (21:00–21:47 UTC), summary prepared at 07:00 local time. Median: 31.5 µg/m³; range across sensors: 24.0–51.2 µg/m³.
In Seoul the air is moderate 🟡 AQI 93. About the same as three hours ago. ⛅ +6 °C · No precipitation · Wind 1 m/s
In Seoul 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 28.8 to 31.9 µg/m³.
Light wind (1 m/s) in the evening or at night, as the air cools, possibly traps particles near the ground (a temperature inversion). High humidity (97%) possibly makes optical sensors read somewhat higher.
Weather now: partly cloudy, 6°C, wind 1 m/s, humidity 97%. No major change in the wind is expected in the coming hours. By 18:00 the temperature will be about 13°C.
Written automatically at 07:00 local time (22:00 UTC) from sensor measurements and the weather forecast. Values are approximate; hypotheses are marked.
1 m/s
Wind, E
0 mm
Precipitation today
16 µg/m³ Moderate
Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 09:00–09:00 UTC+9): 16 µg/m³ from 35 sensors that passed the quality check — the same value as in the Atmy Data Hub.
42/100Moderate · An estimate of weather conditions · not a PM2.5 forecast
15°/6°
Index by time of day
60/100Moderate
Night
Morning
Day
Evening17°/8°
Index by time of day
57/100Moderate
NightMorningDayEvening13°/11°
Index by time of day
58/100Moderate
NightMorningDayEvening17°/6°
Index by time of day
59/100Moderate
NightMorningDayEvening15°/8°
Index by time of day
48/100Moderate
NightMorningDayEvening14°/9°
Index by time of day
45/100Moderate
NightMorningDayEveningForecast of conditions that trap pollution near the surface
6°
Partly cloudy. Feels like 4°C
7°C94%15°C67%11°C86%1m/sWind from the E
3m/sWind gusts
Wind force: 1
Gusts up to 8 m/s are expected.
South Korea
15°C6°C17°C8°C
13°C11°C17°C6°C15°C8°C14°C9°C
10°C3°C3°C-1°C5°C0°C11°C2°C
Highest current reading: 51.2 µg/m³ (Seoul HanNam-Dong). Lowest: 24.0 µg/m³ (도봉구 (한국환경공단 에어코리아 (AirKorea))). The list shows every sensor, highest first.
Source: atmy.ai monitoring network
Sensors in the summary by network: Government stations — 33 sensors, AirGradient — 1 sensor.
Atmy shows the networks’ readings after the Data Hub’s quality check: test devices and sensors that fail it are left out.
529
SeoulSouth Korea
34BusanSouth Korea
30IncheonSouth Korea
27Cities 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.
Daily mean PM2.5 of the city sensors, µg/m³
Click a day to see its date and value.
An Atmy card with the air quality in Seoul now: it is refreshed every 15 minutes and links to this page. Paste the code into your site.
South Korea · City ranking · All pilot cities
Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 09:00–09:00 UTC+9): 16 µg/m³ from 35 sensors that passed the quality check — the same value as in the Atmy Data Hub. No. 10 of 39 cities in South Korea and No. 396 of 676 worldwide, from the most polluted.
Right now in Seoul, PM2.5 averages 31.9 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 34 sensors from Government stations, AirGradient, readings from 06:00–06:47 local time (21:00–21:47 UTC), summary prepared at 07:00 local time. Median: 31.5 µg/m³; range across sensors: 24.0–51.2 µg/m³.
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.
Highest current reading: 51.2 µg/m³ (Seoul HanNam-Dong). Lowest: 24.0 µg/m³ (도봉구 (한국환경공단 에어코리아 (AirKorea))). The list shows every sensor, highest first.
From Atmy sensors and connected public networks (citizen, experimental and government monitors), aggregated by Atmy. Values are approximate; see the methodology.
The summary is rebuilt every 15 minutes from the latest reading of each sensor, each no older than one hour.
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
