Up to 50% of Hong Kong's zenith night sky brightness comes from about 120 decorative and advertising lights, as shown by Earth Hour lights-out events.
Artificial light at night: State of the science 2022
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Natural experiments from Earth Hour reveal urban night sky being drastically lit up by few decorative buildings
Up to 50% of Hong Kong's zenith night sky brightness comes from about 120 decorative and advertising lights, as shown by Earth Hour lights-out events.