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10:03
Hong Kong is an island, but also the name of the city that is installed and with over seven million inhabitants spread over an area of only 200 square kilometers territory: the average population density is thus 35 000 inhabitants / km with records that reach up to 200,000 people per square kilometer in some areas!The frame is very high and dense with a lot of harmful air pollution, noise ... but also light pollution! Recently, the authorities recognize the increasing complaints from residents who have a city that is too bright, too bright at night and disturbs sleep and affects health.
To measure the importance of this photopollution, the University of Hong Kong collected for 3 years more than five million records brightness [1] from 18 sensors placed at various locations in the city: a network entitled Hong Kong Night Sky Brightness Monitoring Network (NSN). This network monitoring light pollution operates continuously and allows to create maps in real time.
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