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 Acoustic environment function area classification 
 The use of regional features and environmental quality requirements, the acoustic environment function area is divided into the following five types: 

 Class 0 acoustic environment functional areas: refers to the rehabilitation and convalescent areas, especially in a quiet area. 

 A sound environment functional areas: residential, health care, culture, education, research, design, administrative office for the main function of the need to maintain a quiet area. 

 Acoustic environment functional areas: the main function of commercial finance, fair trade, or residential, mixed commercial, industrial, need to maintain the residential quiet area. 

 Three types of sound environmental function zones: the main function of industrial production, warehousing and logistics, the need to prevent a serious impact on the area of ??industrial noise on the surrounding environment. 

 Acoustic environment functional areas: transportation routes on both sides of a certain distance, the need to prevent a serious impact on regional traffic noise on the surrounding environment, including 4a and 4b are two types. 4a class highway, a highway, secondary roads, urban expressway, urban trunk roads, urban sub-distributors, urban rail transit (ground segment), on both sides of the inland waterways region; 4b class on both sides of the railway lines area. 

 5, the night noise bursts: the burst of noise at night, the maximum can not exceed the standard value of 15dB 

 , Regional and delineation of the time: (1) various types of standards apply to the area delineated by the local People's Government. (2) of this standard daytime and night time by the local people's government according to the delineation of local habits and seasonal variation. 


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