PRAISE-HK is a cross-institutional collaboration. Discover how we are building a sustainable future. While this is helpful, the numbers only illustrate a general picture about the air quality situation over a very wide geographical area, but they cannot show the street-to-street variations of air quality. Air quality at any urban location is controlled by many factors, including (1) the release of air pollutants from nearby and far away emission sources (e.g., human related sources like vehicles and ships, power plants, industrial plants, residential and commercial buildings, and natural sources like dust storms and forest fires, etc.) (2) the, of pollutants by winds from one place to another, (3) other meteorological factors like temperature, sunshine and rainfall that affect the, of the air pollutants enroute, and (4) urban morphology that affects the. The AQHI is developed by first calculating the sum of the percentage added short-term health risk (%AR) of daily hospital admissions attributable to the 3-hour moving average concentrations of ozone (O3), nitrogen dioxide (NO2), particulate matter (PM), and sulphur dioxide (SO2). These transport may bring the pollutants (and high AQHI) into Hong Kong. For the PRAISE-HK system, we have combined multiple state-of-the-science technologies including the most updated emission inventories, land-use characteristics, large-scale coarse resolution weather prediction and photo-chemical air quality models, very fine-scale high resolution urban street canyon model, traffic simulation models, and big data analytics to provide the best short-term analysis and medium-term forecasts of air quality down to individual streets. of the air quality and health risk information vary, ranging from the finest resolution of. These transport may bring the pollutants (and high AQHI) into Hong Kong. , limited to a small number of monitoring sites and designed to depict the average air quality over different districts, cannot show the fine scale street-to-street variations of air quality. The project has been receiving the support of the Environmental Protection Department, Energizing Kowloon East Office, medical professionals and environmental NGOs. “-“ means that the data is temporarily unavailable. These are “short-term” risks because the use of time-series analysis of short-term (daily) variations, as contrasted to other “long-term” risks derived from incidence analysis on long-term (annual-averaged) pollution and mortality or cancer case data. But we anticipate that, in the future, apps similar to PRAISE-HK will be developed for other cities and regions.