The temperature of Hong Kong's urban areas has increased in recent years and this is the urban heat island (UHI) effect. In addition to causing an increase in temperature in urban areas, the UHI effect also induces unwanted impacts on Hong Kong citizens who live in urban areas. We will never underestimate the potential dangers caused by the UHI effect and we should treat it more seriously. This article will give a brief introduction to the UHI effect, its influence and possible measures to deal with it. WHAT IS THE URBAN HEAT ISLAND EFFECT (UHI)? The urban heat island (UHI) effect mainly describes the nighttime temperature difference between urban and rural areas due to urbanization. This effect is particularly evident at night because the temperature in rural areas drops very quickly while the temperature in cities drops very slowly at night. Before discussing the UHI effect, we first need to understand why there is such a difference in temperature? Reasons for the occurrence of the UHI effect First of all, buildings in urban areas have greater thermal capacity than those in rural areas. Thus, buildings in urban areas store more thermal energy. At night, buildings in urban areas will therefore cool much more slowly. Second, buildings in urban areas are often very tall, which will limit heat loss into space. Therefore, urban areas are much warmer than rural areas. In addition, a large amount of waste heat is produced by air conditioning, vehicles and fuel combustion, which will lead to an increase in temperature in urban areas. Densely developed urban areas have lower wind speeds. Therefore, less heat can be dissipated. In addition, in rural areas there are...... middle of paper...... The Earth Sciences Department of the United States National Aeronautics and Space Administration (NASA), said NASA and the U.S. Centers for Disease Control and Prevention are jointly working on a project to use remote sensing data to estimate airborne particles over the Atlanta, Georgia metropolitan area . He said this project is known as Health and Environment Linked Information Exchange (HELIX-Atlanta). Its goal is to examine the feasibility of building an integrated electronic health and environmental data network in five counties in the Atlanta metropolitan area. An additional challenge is estimating exposure to environmental hazards such as particles 2.5 micrometers or less (PM2.5). An evening excursion was also organized during the two-day workshop for participants to observe and experience first. hand over UHI effects to Hong Kong.