Hong Kong is one of the world's highest-density cities, with over sixty thousand persons per square kilometer in its urban areas. High-rise, bulky and closely packed buildings are the norm,This reduces urban air ventilation. Since 2003, the Hong Kong Government has commissioned studies on the issue; an air ventilation assessment (AVA) study was carried out. One of the key issues regarding the AVA assessment and the planning quest for better urban ventilation is a need for a better understanding of the wind environment. In a nutshell, what kind of wind are we designing for in our city? What are the characteristics of this wind? This paper elaborates piloted efforts to understand the Hong Kong's wind environment based on a detailed analysis of Hong Kong observatory's ten year wind data. It can be concluded that designing for the available wind can be a very complicated matter especially when the city is affected by various phenomena like topography, land and sea breezes, and so on.
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