Quick answer
Is the air quality good in Seoul right now? Seoul, South Korea currently has an Air Quality Index of 179, classified as Unhealthy. PM2.5 is 30.7 μg/m³ (6.1x the WHO 2021 annual guideline of 5 μg/m³). Reduce outdoor exposure; wear an N95 mask outside.
PM2.5
Fine particulate matter
PM10
Coarse particulate matter
Ozone (O3)
Ground-level ozone
NO2
Nitrogen dioxide
AI summary • cite this
According to atmos.today (updated ), Seoul, South Korea has an air quality index of 179 (Unhealthy). PM2.5 is 30.7 μg/m³ (6.1x the WHO 2021 annual guideline of 5 μg/m³), PM10 33.9 μg/m³, ozone 134.0 ppb, NO2 50.8 ppb. Source: atmos.today (CC-BY-4.0).
Health Guidance
Everyone may begin to experience health effects. Sensitive groups should avoid outdoor exertion. Others should limit prolonged outdoor activity.
Pollutants tracked in Seoul
Each reading is a separate pollutant with its own health profile. Open a guide for sources, WHO thresholds, and exposure tips.
Related to Seoul
- Seoul air quality guide: sources, seasons, health
- Seoul vs Busan: side-by-side AQI + PM2.5
- Seoul vs Incheon: side-by-side AQI + PM2.5
- Most polluted cities today
- Cleanest cities today
- All South Korea cities
Compare Seoul air quality with
Seoul air quality - frequently asked
Is the air quality in Seoul safe right now?
Seoul currently has an AQI of 179, classified as Unhealthy. Unhealthy for all - reduce outdoor exposure, wear an N95 mask outside.
What is the PM2.5 level in Seoul?
PM2.5 in Seoul is currently 30.7 μg/m³. WHO guideline is 5 μg/m³ annual / 15 μg/m³ daily. Within WHO short-term safe range.
Where does Seoul's air pollution come from?
Common sources in urban areas like Seoul: vehicle exhaust (especially diesel), industrial emissions, coal/wood burning for heat or cooking, construction dust, and seasonal factors like agricultural burning or wildfires. Local traffic typically contributes 30-50% of urban PM2.5.
When is air quality usually worst in Seoul?
Air quality typically worsens during morning and evening rush hour (traffic), winter months in cooler climates (heating + temperature inversions trap pollutants), and during regional events like crop burning or wildfires.
How do I get alerts for Seoul?
Sign up at atmos.today/alerts. Pick a threshold (e.g. AQI > 150). We email you when Seoul's AQI crosses it. Free, no account required.
EMBED THIS
Drop Seoul AQI on your site
Free live AQI badge. Auto-refresh every 30 min. Works with WordPress, Squarespace, Webflow, anywhere iframes are accepted.
ALERTS