Worst air pollution Osan, today and tomorrow
Today (16 July): Air quality in Osan is very poor. AQI and NO2 are very poor; O3 is poor; PM2.5 and PM1 are fair; SO2 is medium; PM10, CO, and HCHO are good. Pollution peaks around 9:00 PM (NO2: 93.0/100).
Tomorrow (17 July 2026): Air quality in Osan is very poor. PM2.5 decreases to medium; O3 increases to very poor; PM1 decreases to medium; all other pollutants stay as today. Pollution peaks around 8:00 PM (NO2: 100/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Osan's air quality reflects the flat Gyeonggi-do southern Seoul metropolitan corridor adjacent to Osan Air Base, with the US military aviation operations and vehicle traffic on surrounding roads generating elevated NOₓ alongside the surrounding manufacturing and residential character. Seasonal Chinese dust transport elevates PM10 during spring yellow dust episodes, while the aviation operations represent the most distinctive local emission source throughout the year.
Today - 16 July | Pollution peaks at 21:00
AQI:
Very poor
93.0/100
PM2.5 (fine particles):
Fair
36.7/100
PM10 (coarse particles):
Good
17.7/100
NO2 (nitrogen dioxide):
Very poor
93.0/100
O3 (ozone):
Poor
61.3/100
SO2 (sulfur dioxide):
Medium
47.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.9/100
PM1 (ultrafine particles):
Fair
39.3/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 20:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Medium
43.1/100
PM10 (coarse particles):
Good
17.2/100
NO2 (nitrogen dioxide):
Very poor
100/100
O3 (ozone):
Very poor
99.7/100
SO2 (sulfur dioxide):
Medium
50.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
17.8/100
PM1 (ultrafine particles):
Medium
45.9/100
Frequently Asked Questions
Is air quality bad in Osan right now?
On 16 July 2026, overall air quality in Osan is very poor. AQI is the main air quality indicator at 93.0/100. Pollution peaks around 9:00 PM (NO2: 93.0/100).
Will air quality be worse tomorrow in Osan?
On 17 July 2026, air quality conditions in Osan will be similar to today, with AQI forecast at very poor at 100/100. Pollution peaks around 8:00 PM (NO2: 100/100).
When is air pollution at its worst in Osan?
Osan usually sees its poorest air quality when vehicle traffic, aircraft operations at the local air base, along with manufacturing and food processing coincide with periods when windblown dust events occur. These wind events can carry dust in from the surrounding arid landscape. Such events are most common in the drier shoulder seasons.
Are air quality levels in Osan 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.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app