The Environmental Protection Department (EPD) of Hong Kong Government started the reporting of the Air Pollution Index (API) and its forecast in June 1995. API is calculated by comparing the concentrations of five pollutants, namely, nitrogen dioxide, sulpher dioxide, ozone, carbon monoxide, respirable suspended particulate, measured at EPD's leveln air quality monitoring stations with respect to the Hong Kong Air Quality Objectives. The Hong Kong API is a 5B_2B index system with nine sub-indices being modeled separately by stratified multiple regression models, recommended by a consultancy study carried out in the early 90's. The EPD has been reporting to the public the daily API and the forecast of the following day for three land use categories: Urban, New Development and Industrial.
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