South Korea

Seoul

Name: Seoul
Address: South Korea

149

Unhealthy for Sensitive Groups

Air Quality Index

Updated Mar 21, 02:00 AM · Data from OpenAQ

Current Pollution Levels in Seoul

PM2.5

Sensitive

µg/m³

PM10

Moderate

µg/m³

O₃

—

0.0198

ppm

Seoul Air Quality 24-Hour Trend

Air Quality Analysis for Seoul

Seoul, South Korea air quality this morning is rated Unhealthy for Sensitive Groups with an Air Quality Index (AQI) of 149. The primary pollutant PM2.5 is measured at 55 µg/m³. PM10 (coarse particles) is at 70 µg/m³.

The current PM2.5 level exceeds the WHO 24-hour guideline of 45 µg/m³. Prolonged exposure at this level poses health risks, particularly for vulnerable populations including children, elderly, and those with respiratory conditions.

PM2.5 levels are stable, staying close to the recent average of 49.0 µg/m³.

Health Recommendation

Sensitive groups in Seoul — including children, elderly, and those with asthma or heart disease — should limit prolonged outdoor activity. Consider wearing an N95 mask if spending extended time outdoors.

Outdoor Exercise

Reduce intensity

Window Ventilation

Keep windows closed

Recent Seoul Air Quality Measurements

Time	AQI	PM2.5	PM10
02:00 AM	149	55	70
01:00 AM	137	50	67
12:00 AM	137	50	69
11:55 PM	137	50	69
11:22 PM	137	50	65
11:07 PM	110	39	56

Frequently Asked Questions

Is air quality in Seoul safe today?

Seoul air quality is unhealthy for sensitive groups today (AQI 149). Children, elderly, and people with respiratory conditions should limit prolonged outdoor exposure.

What AQI level is considered unhealthy?

According to EPA standards, AQI 0-50 is Good, 51-100 is Moderate, 101-150 is Unhealthy for Sensitive Groups, 151-200 is Unhealthy, 201-300 is Very Unhealthy, and above 300 is Hazardous. The WHO recommends annual PM2.5 levels below 15 µg/m³ for optimal health.

Should I wear a mask today in Seoul?

With Seoul's AQI at 149, wearing an N95 mask is recommended for outdoor activities, especially for sensitive groups. PM2.5 levels are at 55 µg/m³, which exceeds the EPA moderate threshold.