http://www.epd.gov.hk/epd/english/en...s/CG_E-06n.pdf
Page 4, section 2: Noise from Domestic Premises and Public Places (sections 4 and 5)
Noise from domestic premises or public places includes noise which is produced in domestic premises by sources such as television sets, air conditioners or dogs, and noise produced in public places by sources such as radios, hawkers or loudspeakers. Both sections 4 and 5 came into operation on 1 November 1989.
Section 4 of the Ordinance is a general provision to control noise of this nature which is causing annoyance to any person at night (11 p.m. to 7 a.m.) or on a general holiday.