AQI World

Seoul Air Quality Index

Seoul, South Korea · Real-time AQI data

Unhealthy

Some members of the general public may experience health effects.

Pollutant Breakdown

PM2.5

152µg/m³

PM10

63µg/m³

O₃

17ppm

NO₂

52.9ppb

SO₂

4.8ppb

CO

8.3ppm

Station: Seoul (서울) · Mar 18, 08:00 AM · Updates every 30 min

Health Recommendations

Unhealthy

Some members of the general public may experience health effects.

General Public: Reduce prolonged or heavy outdoor exertion. Take more breaks.
Children: Avoid prolonged or heavy outdoor exertion.
Elderly: Avoid all outdoor exertion.
Heart Conditions: Avoid all outdoor exertion.
Lung Conditions: Avoid all outdoor exertion.

How does Seoul compare to other cities?

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AQI Scale Reference

0–50
Good
51–100
Moderate
101–150
Unhealthy for Sensitive Groups
151–200
Unhealthy
201–300
Very Unhealthy
301–500
Hazardous

About Air Quality in Seoul

The Air Quality Index (AQI) in Seoul is measured using monitoring stations that track six key pollutants: PM2.5, PM10, ground-level ozone, nitrogen dioxide, sulfur dioxide, and carbon monoxide. The AQI is calculated using US EPA standards and ranges from 0 (excellent) to 500 (hazardous).

PM2.5 is typically the dominant pollutant in Seoul during high-pollution periods. Fine particulate matter from traffic, industry, and seasonal factors can push AQI above 150, which is considered unhealthy for all groups.

Check the health effects guide to understand what today's AQI means for your activity level, or see the global AQI rankings to compare Seoul with other cities worldwide.