HK AQHI is a free Android app developed by Fresh-Ideas Studio that provides real-time broadcasting of the Air Quality Health Index (AQHI) reported by the Environmental Protection Department of the Government of Hong Kong Special Administrative Region. The AQHI is reported on a scale of 1 to 10 and 10+, grouped into five health risk categories: low, moderate, high, very high, and serious.

The app provides a range of air quality information, including the forecast of health risk of general and roadside monitoring stations, AQHI of each general and roadside monitoring station, AQHI of each district, and air pollutant concentrations of each station and their past 24-hour trends. Additionally, it allows users to preset health risk alerts according to their needs, such as by station type, forecast or current AQHI, monitoring station or district, and health risk level.

Overall, HK AQHI is a useful app for those living in Hong Kong who want to stay informed about the air quality in their area and take necessary precautions to protect their health.