Worst air pollution Sŏsan, today and tomorrow
Today (10 August): Air quality in Sŏsan is fair. NO2 is fair; AQI and O3 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (O3: 41.5/100).
Tomorrow (11 August 2026): Air quality in Sŏsan is fair. AQI worsens to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 6:00 PM (O3: 38.1/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Sŏsan's air quality reflects the South Korean Chungnam Asan Bay coastal position adjacent to the Hyundai Oilbank refinery and the Daesan Industrial Complex, with vehicle traffic on surrounding roads and the petrochemical refinery and chemical complex generating elevated industrial SO₂ and VOCs alongside vehicle sources. Yellow Sea breezes provide coastal ventilation, while the petrochemical complex's industrial scale represents Seosan's most distinctive local air quality contribution throughout most of the year.
Today - 10 August | Pollution peaks at 15:00
AQI:
Medium
41.5/100
PM2.5 (fine particles):
Good
9.9/100
PM10 (coarse particles):
Good
3.6/100
NO2 (nitrogen dioxide):
Fair
27.1/100
O3 (ozone):
Medium
41.5/100
SO2 (sulfur dioxide):
Good
5.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.4/100
PM1 (ultrafine particles):
Good
8.5/100
Levels show the poorest local air quality during the day
Tomorrow - 11 August | Pollution peaks at 18:00
AQI:
Fair
38.1/100
PM2.5 (fine particles):
Good
10.1/100
PM10 (coarse particles):
Good
3.7/100
NO2 (nitrogen dioxide):
Fair
32.8/100
O3 (ozone):
Fair
38.1/100
SO2 (sulfur dioxide):
Good
8.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.9/100
PM1 (ultrafine particles):
Good
8.6/100
Frequently Asked Questions
Is air quality bad in Sŏsan right now?
On 10 August 2026, overall air quality in Sŏsan is fair. NO2 is the main pollutant at 27.1/100. Pollution peaks around 3:00 PM (O3: 41.5/100).
Will air quality be worse tomorrow in Sŏsan?
On 11 August 2026, air quality conditions in Sŏsan will be similar to today, with AQI forecast at fair at 38.1/100. Pollution peaks around 6:00 PM (O3: 38.1/100).
When is air pollution at its worst in Sŏsan?
The biggest local contributors to pollution in Sŏsan are traffic on the surrounding roads as well as steel, cement, and chemical production, particularly once windblown dust events occur. These wind events can carry dust in from the surrounding arid landscape. Onshore breezes usually help clear the air, but pollution can build up when winds are light.
Are air quality levels in Sŏsan based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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