California Health and Safety Code Section 46000 (a) Excessive noise is a serious hazard to the public health and welfare. (b) Exposure to certain levels of noise can result in physiological, psychological and economic damage. . . . (f) All Californians are entitled to a peaceful and quiet environment without the intrusion of noise which may be hazardous to their health and welfare. Section 118825. The Legislature, recognizing the growing problem of noise pollution throughout the state and that we are daily assaulted with increased noise from advancing technology, machines, vehicles, and human clamor, declares that excessive noise must be considered a degradation of our environment and a health hazard to our citizens. (Introduction to a section regulating aircraft noise.) California Vehicle Code Section 27001: (a) The driver of a motor vehicle when reasonably necessary to insure safe operation shall give audible warning with his [sic] horn. (b) The horn shall not otherwise be used, except as a theft alarm system Section 27007: No driver of a vehicle shall operate, or permit the operation of, any sound amplification system which can be heard outside the vehicle from 50 feet or more when the vehicle is being operated upon a highway, unless that system is being operated to request assistance or warn of a hazardous situation. Section 27150: (a) Every motor vehicle subject to registration shall at all times be equipped with an adequate muffler in constant operation and properly maintained to prevent any excessive or unusual noise, and no muffler or exhaust system shall be equipped with a cutout, bypass or similar device. Los Angeles Municipal Code Sec.41.40: No person shall, between the hours of 9:00 P.M. and 7:00 A.M. of the following day, perform any construction or repair work of any kind . . . which makes loud noises to the disturbance of persons occupying sleeping quarters in any . . . place of residence. Any person who knowingly and wilfully violates the foregoing provision shall be deemed guilty of a misdemeanor . . . [this was amended in 1984 to specify that such noise may not occur before 8:00 A.M. on Saturday, and may not occur at all on Sunday; Section 41.40(c).] ARTICLE 5 AMPLIFIED SOUND SEC. 115.01. PURPOSE. The Council enacts this legislation for the sole purpose of securing and promoting the public health, comfort, safety, and welfare of its citizenry. While recognizing that certain uses of sound amplifying equipment are protected by the constitutional rights of freedom of speech and assembly, the Council nevertheless feels obligated to reasonably regulate the use of sound amplifying equipment in order to protect the correlative constitutional rights of the citizens of this community to privacy and freedom from the public nuisance of loud and unnecessary noise. SEC. 115.02. PROHIBITION AND REGULATIONS. It shall be unlawful for any person, other than personnel of law enforcement or governmental agencies, or permittees duly authorized to use the same pursuant to Sec. 103.111 of this Code, to install, use, or operate within the City a loudspeaker or sound amplifying equipment in a fixed or movable position or mounted upon any sound truck for the purpose of giving instructions, directions, talks, addresses, lectures, or transmitting music to any persons or assemblages of persons in or upon any public street, alley, sidewalk, park, or place, or other public property except when installed, used or operated in compliance with the following provisions: (a) In all residential zones and within 500 feet thereof, no sound amplifying equipment shall be installed, operated or used for commercial purposes at any time. (b) The operation or use of sound amplifying equipment for noncommercial purposes in all residential zones and within 300 feet thereof, except when used for regularly scheduled operative functions by any school or for the usual and customary purposes of any church, is prohibited between the hours of 4:30 p.m. and 9:00 a.m. of the following day. (c) In all zones, except such portions thereof as may be included within 500 feet of any residential zone, the operation or use of sound amplifying equipment for commercial purposes is prohibited between the hours of 9:00 p.m. and 7:00 a.m. of the following day. (d) In all other zones, except such portions thereof as may be included within 500 feet of any residential zone, the operation of use of sound amplifying equipment for noncommercial purposes is prohibited between the hours of 10:00 p.m. and 7:00 a.m. of the following day. (e) The only sounds permitted shall be either music, human speech, or both. (f) Sound emanating from sound amplifying equipment shall be limited in volume, tone and intensity as follows: 1. The sound shall not be audible at a distance in excess of 200 feet from the sound equipment. ARTICLE 6 GENERAL NOISE SEC. 116.01 LOUD, UNNECESSARY AND UNUSUAL NOISE. Notwithstanding any other provisions of this chapter and in addition thereto, it shall be unlawful for any person to willfully make or continue, or cause to be made or continued, any loud, unnecessary, and unusual noise which disturbs the peace or quiet of any neighborhood or which causes discomfort or annoyance to any reasonable person of normal sensitiveness residing in the area. The standard which may be considered in determining whether a violation of the provisions of this section exists may include, but not be limited to, the following: (a) The level of noise; (b) Whether the nature of the noise is usual or unusual; (c) Whether the origin of the noise is natural or unnatural; (d) The level and intensity of the background noise, if any; (e) The proximity of the noise to residential sleeping facilities; (f) The nature and zoning of the area within which the noise emanates; (g) The density of the inhabitation of the area within which the noise emanates; (h) The time of the day and night the noise occurs; (i) The duration of the noise; (j) Whether the noise is produced by a commercial or noncommercial activity.