South Korea · Asia/Seoul
Ansan 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 14:00 KST · CAMS model estimate, may differ from monitoring stations and street-level conditions
Updated recently · Page generated 2026-10-31 14:50 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 particles4.7 µg/m³
- PM10Coarse particles5.2 µg/m³
- O3Ozone74.7 µg/m³
- NO2Nitrogen dioxide11.8 µg/m³
- SO2Sulphur dioxide8.9 µg/m³
- COCarbon monoxide186.8 µg/m³
Weather in Ansan
See the temperature, rain and wind forecast for Ansan.
Ansan 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 |
|---|---|---|---|---|---|---|
| 5.5 | 6.0 | 71.7 | 13.1 | 9.2 | 192.8 | |
| 6.4 | 7.0 | 66.8 | 15.9 | 9.7 | 198.9 | |
| 7.9 | 8.5 | 53.1 | 26.1 | 10.9 | 215.6 | |
| 13.5 | 14.1 | 12.1 | 59.9 | 15.9 | 302.1 | |
| 20.3 | 21.0 | 5.4 | 64.1 | 23.8 | 398.9 | |
| 25.4 | 26.3 | 1.8 | 66.4 | 31.3 | 462.1 | |
| 31.1 | 32.1 | 0.1 | 66.7 | 40.4 | 528.7 | |
| 36.9 | 37.9 | 0.0 | 65.4 | 49.4 | 597.4 | |
| 40.8 | 41.8 | 0.0 | 64.6 | 51.7 | 651.7 | |
| 41.9 | 42.8 | 0.0 | 63.5 | 46.6 | 681.9 | |
| 39.1 | 39.8 | 0.0 | 61.4 | 38.7 | 657.3 | |
| 37.7 | 38.3 | 0.0 | 59.5 | 34.6 | 650.0 | |
| 35.8 | 36.3 | 0.0 | 58.8 | 32.8 | 633.1 | |
| 36.1 | 36.6 | 0.0 | 56.5 | 31.1 | 649.5 | |
| 36.6 | 37.0 | 0.0 | 54.6 | 32.4 | 672.4 | |
| 35.5 | 35.9 | 0.0 | 55.4 | 34.5 | 671.5 | |
| 35.4 | 36.4 | 0.1 | 58.2 | 40.5 | 670.6 | |
| 35.0 | 36.2 | 0.7 | 59.9 | 44.8 | 652.0 | |
| 37.5 | 38.5 | 1.6 | 56.7 | 47.6 | 714.1 | |
| 34.6 | 35.7 | 2.0 | 54.7 | 43.9 | 621.7 | |
| 31.8 | 32.9 | 4.0 | 53.1 | 37.9 | 499.9 | |
| 29.3 | 30.5 | 4.6 | 53.3 | 33.4 | 435.3 | |
| 26.6 | 28.1 | 6.8 | 53.0 | 28.1 | 387.4 | |
| 25.0 | 26.4 | 6.8 | 53.7 | 24.9 | 367.1 |
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 14:00 KST. Retrieved: 2026-10-31T03:36:24.677949+00:00.
- Page generated from a snapshot with data state FRESH; model age 17.9 hours at generation.
- Nearest valid 0.4° model grid cell, about 14 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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