NDLI: Night-sky brightness monitoring in Hong Kong : A city-wide light pollution assessment

Content Provider	Springer Nature Link
Author	Pun, Chun Shing Jason So, Chu Wing
Copyright Year	2011
Abstract	Results of the first comprehensive light pollution survey in Hong Kong are presented. The night-sky brightness was measured and monitored around the city using a portable light-sensing device called the Sky Quality Meter over a 15-month period beginning in March 2008. A total of 1,957 data sets were taken at 199 distinct locations, including urban and rural sites covering all 18 Administrative Districts of Hong Kong. The survey shows that the environmental light pollution problem in Hong Kong is severe—the urban night skies (sky brightness at 15.0 mag arcsec − 2) are on average ~ 100 times brighter than at the darkest rural sites (20.1 mag arcsec − 2), indicating that the high lighting densities in the densely populated residential and commercial areas lead to light pollution. In the worst polluted urban location studied, the night-sky at 13.2 mag arcsec − 2 can be over 500 times brighter than the darkest sites in Hong Kong. The observed night-sky brightness is found to be affected by human factors such as land utilization and population density of the observation sites, together with meteorological and/or environmental factors. Moreover, earlier night skies (at 9:30 p.m. local time) are generally brighter than later time (at 11:30 p.m.), which can be attributed to some public and commercial lightings being turned off later at night. On the other hand, no concrete relationship between the observed sky brightness and air pollutant concentrations could be established with the limited survey sampling. Results from this survey will serve as an important database for the public to assess whether new rules and regulations are necessary to control the use of outdoor lightings in Hong Kong.
Starting Page	2537
Ending Page	2557
Page Count	21
File Format	PDF
ISSN	01676369
Journal	Environmental Monitoring and Assessment
Volume Number	184
Issue Number	4
e-ISSN	15732959
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-06-29
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Air pollutant concentration Environmental assessment Environmental monitoring Light pollution Night-sky brightness Pollution risk Ecology Ecotoxicology Environmental Monitoring/Analysis Environmental Management Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Pollution Medicine Management, Monitoring, Policy and Law

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