Å City of Dust presents fine particle forecast in Seoul city where fine particle in the air created massive medical problems and nation-wide issues among Korean Society. Å City of Dust inspired by N Seoul Tower, the iconic landmark of Seoul which provides air quality level via its ambient light. This app provides real-time data of Coarse and Fine particle for different districts in Seoul and brings up an awareness of danger of the fine particle via "learn" page and provides act of conduct by density level.