Khoi Bui measures the Air Quality Index (AQI), a number used by governmental and international health organizations to indicate air pollution. When pollution blankets the city, it affects everyone, regardless of where you live in Ho Chi Minh City. Groups most at risk are infants, the elderly and people with chronic respiratory illness. The app fetches AQI in real-time from the US Embassy air quality monitoring station in District 1, Ho Chi Minh City. Real-time notifications sent directly to your phone when a significant change in air quality occurs, helping you to safely plan your outdoor activities. The app is intuitive and simple, giving you the only information you need to breathe easy in Ho Chi Minh city.