noise ordinance

Noise regulation includes statutes or guidelines relating to sound transmission established by national, state or provincial and municipal levels of government. After the watershed passage of the United States Noise Control Act of 1972, other local and state governments passed further regulations.
A noise regulation restricts the amount of noise, the duration of noise and the source of noise. It usually places restrictions for certain times of the day.Although the United Kingdom and Japan enacted national laws in 1960 and 1967 respectively, these laws were not at all comprehensive or fully enforceable as to address generally rising ambient noise, enforceable numerical source limits on aircraft and motor vehicles or comprehensive directives to local government.
Quiet hours are times during a day or night when there are placed tighter restrictions on unnecessary or bothersome noise. They vary between jurisdictions and areas, but are typically in place during night-time, for example between 23:00 and 07:00, so as not to interfere with residents sleep. Some noise measurement standards which takes into account different times of the day are the American day-night average sound level (Ldn) standard or the European day–evening–night noise level (Lden) standard. Some jurisdictions also have wider noise restrictions in the weekends or on certain public holidays. Industrial or nightlife areas may be exempt or have fewer restrictions, while private institutions, hotels and universities may place additional restrictions on their guests.

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