City comparison
Tokyo vs Seoul air quality
Live AQI comparison between Tokyo and Seoul. Data updates every 15 minutes.
Tokyo and Seoul differ by 13 AQI points right now. Tokyo has cleaner air at this moment.
What drives air quality in Tokyo and Seoul
Tokyo
Tokyo generally maintains moderate air quality for a megacity, but exposure still varies around major highways, dense rail hubs, and industrial bayside areas. Nitrogen dioxide remains a roadside concern during commuting peaks. Urban heat and building density can shape local dispersion, creating noticeable differences between districts and waterfront zones.
Seoul
Seoul experiences strong daily variation due to dense traffic, urban canyons, and regional background pollution. Roadside nitrogen dioxide peaks often align with commute intensity, while PM2.5 can remain elevated across broader areas. City topography and building density influence how quickly pollutants disperse after emission peaks.
Both cities are shaped by different combinations of traffic density, terrain, weather patterns, and seasonal events, which is why the same AQI band can feel different on the ground. Checking live readings rather than relying on reputation or past visits is the most reliable way to plan travel, exercise, or outdoor time between the two.
Live AQI from Open-Meteo (CAMS). Conditions change hourly — refresh for the latest readings. South African cities may show WAQI station data on their dedicated pages.