Worst air pollution Hongseong, today and tomorrow
Today (16 July): Air quality in Hongseong is very poor. AQI and NO2 are very poor; PM2.5, SO2, and PM1 are fair; O3 is medium; PM10, CO, and HCHO are good. Pollution peaks around 9:00 PM (NO2: 81.4/100).
Tomorrow (17 July 2026): Air quality in Hongseong is very poor. PM2.5 decreases to medium; O3 increases to poor; SO2 decreases to medium; PM1 decreases to medium; all other pollutants stay as today. Pollution peaks around 10:00 PM (NO2: 97.8/100). 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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Hongseong's air quality reflects the South Korean Chungnam Hongseong Bay and Asan Bay coastal position, with vehicle traffic on surrounding roads and the agricultural, services, and government corridor contributing local sources. Yellow Sea breezes provide coastal ventilation, while seasonal Chinese dust transport elevates PM10 and the regional Chungnam agricultural background maintains moderate South Korean western coastal provincial city readings throughout most of the year.
Today - 16 July | Pollution peaks at 21:00
AQI:
Very poor
81.4/100
PM2.5 (fine particles):
Fair
26.5/100
PM10 (coarse particles):
Good
13.3/100
NO2 (nitrogen dioxide):
Very poor
81.4/100
O3 (ozone):
Medium
54.4/100
SO2 (sulfur dioxide):
Fair
39.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.1/100
PM1 (ultrafine particles):
Fair
30.8/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 22:00
AQI:
Very poor
97.8/100
PM2.5 (fine particles):
Medium
41.0/100
PM10 (coarse particles):
Good
14.5/100
NO2 (nitrogen dioxide):
Very poor
97.8/100
O3 (ozone):
Poor
78.9/100
SO2 (sulfur dioxide):
Medium
46.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
13.0/100
PM1 (ultrafine particles):
Medium
43.1/100
Frequently Asked Questions
Is air quality bad in Hongseong right now?
On 16 July 2026, overall air quality in Hongseong is very poor. AQI is the main air quality indicator at 81.4/100. Pollution peaks around 9:00 PM (NO2: 81.4/100).
Will air quality be worse tomorrow in Hongseong?
On 17 July 2026, air quality conditions in Hongseong will be similar to today, with AQI forecast at very poor at 97.8/100. Pollution peaks around 10:00 PM (NO2: 97.8/100).
When is air pollution at its worst in Hongseong?
Hongseong usually sees its poorest air quality when traffic emissions, crop farming, together with shipbuilding and port operations coincide with periods when dry spells bring strong winds. Strong seasonal winds can lift dust from the surrounding dry terrain and push particulate levels sharply higher. Maritime airflow normally ventilates the area well, though calmer spells let levels rise.
Are air quality levels in Hongseong 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