South Korea · Asia/Seoul
Sejong air quality
AQI estimate unavailable
CAMS model-based US AQI estimate
Complete eligible model windows are not available within the stale policy; pollutant concentrations are shown below.
Model values for Oct 31 15:00 KST · CAMS model estimate, may differ from monitoring stations and street-level conditions
Data may be delayed · Page generated 2026-10-31 15:22 KST
AirNow by Skymory is an independent service; it is not affiliated with or endorsed by U.S. EPA or the official AirNow service.
Pollutants now (modeled)
- PM2.5Fine particles5.1 µg/m³
- PM10Coarse particles7.2 µg/m³
- O3Ozone82.2 µg/m³
- NO2Nitrogen dioxide10.1 µg/m³
- SO2Sulphur dioxide5.9 µg/m³
- COCarbon monoxide163.4 µg/m³
Weather in Sejong
See the temperature, rain and wind forecast for Sejong.
Sejong weather forecast on SkymoryNext 24 hours: PM2.5
Pollutant forecast
Hourly model samples in local time; no interpolation.
| Local time | PM2.5 µg/m³ | PM10 µg/m³ | O3 µg/m³ | NO2 µg/m³ | SO2 µg/m³ | CO µg/m³ |
|---|---|---|---|---|---|---|
| 3.6 | 4.1 | 80.5 | 12.6 | 6.1 | 166.7 | |
| 4.0 | 4.2 | 68.3 | 21.5 | 7.0 | 186.3 | |
| 6.5 | 6.7 | 29.7 | 51.8 | 8.6 | 248.5 | |
| 10.1 | 10.3 | 2.6 | 75.0 | 10.7 | 320.8 | |
| 12.9 | 13.2 | 0.0 | 75.3 | 12.9 | 375.9 | |
| 15.6 | 16.2 | 0.0 | 72.9 | 15.2 | 434.4 | |
| 18.8 | 19.6 | 0.0 | 71.2 | 18.3 | 508.1 | |
| 21.6 | 22.6 | 0.0 | 69.4 | 20.4 | 571.2 | |
| 24.3 | 25.3 | 0.0 | 67.5 | 21.9 | 629.7 | |
| 26.0 | 26.9 | 0.0 | 65.5 | 22.4 | 661.0 | |
| 26.3 | 27.1 | 0.0 | 61.3 | 20.1 | 673.4 | |
| 26.1 | 26.9 | 0.0 | 57.8 | 18.1 | 668.7 | |
| 24.6 | 25.3 | 0.0 | 55.2 | 15.8 | 644.4 | |
| 21.8 | 22.6 | 0.0 | 59.5 | 15.5 | 534.4 | |
| 21.1 | 21.8 | 0.0 | 56.5 | 14.4 | 534.3 | |
| 22.2 | 22.9 | 0.1 | 55.3 | 14.9 | 562.4 | |
| 25.3 | 26.2 | 0.3 | 55.3 | 17.1 | 643.5 | |
| 26.5 | 27.5 | 0.8 | 53.8 | 16.9 | 663.5 | |
| 26.6 | 27.6 | 1.3 | 51.9 | 15.9 | 613.3 | |
| 24.6 | 25.6 | 1.9 | 51.1 | 15.2 | 566.2 | |
| 25.5 | 26.6 | 2.6 | 52.2 | 15.0 | 530.2 | |
| 25.3 | 26.4 | 3.7 | 55.2 | 15.2 | 468.2 | |
| 25.1 | 26.3 | 3.9 | 54.8 | 14.2 | 470.0 | |
| 24.3 | 25.7 | 4.1 | 55.1 | 13.1 | 467.9 |
Data details: about this air quality estimate
Values are modeled by the Copernicus Atmosphere Monitoring Service (CAMS) global forecast, extracted and converted by Skymory for this city. They are model estimates on a coarse grid, not measurements from monitoring stations, and they do not resolve street-level exposure.
- Model initialization: 2026-10-30T12:00:00+00:00. Values valid: Oct 31 15:00 KST. Retrieved: 2026-10-31T03:37:02.653660+00:00.
- Page generated from a snapshot with data state STALE_USABLE; model age 18.4 hours at generation.
- Nearest valid 0.4° model grid cell, about 12 km from the city point.
- Gases are converted with matching model-level 137 temperature, humidity, surface pressure (lnsp) and hybrid coefficients; particulate matter is read directly from the surface fields.
- AQI estimate completeness: UNAVAILABLE (COMPLETE means all six pollutants have a complete model window).
The AQI estimate applies EPA breakpoints (May 2026) to explicit trailing model windows (PM 24 h, CO 8 h, NO2 1 h, SO2 and O3 per EPA rules). It is not a station observation, official daily maximum or NowCast, and the official AQI field remains unavailable.
Surface compatibility by pollutant
| Pollutant | Surface compatibility |
|---|---|
| PM2.5 | DIRECT_SURFACE |
| PM10 | DIRECT_SURFACE |
| O3 | DERIVABLE_SURFACE |
| NO2 | DERIVABLE_SURFACE |
| SO2 | DERIVABLE_SURFACE |
| CO | DERIVABLE_SURFACE |
Source and license
Contains modified Copernicus Atmosphere Monitoring Service information 2026; city extraction and concentration conversion. CAMS global atmospheric composition forecasts (ECMWF/CAMS). CC BY 4.0.
Provider times stay separate from page generation: collecting data or regenerating this page never resets the source time. Data sources and methodology
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