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Shenzhen, Dongguan City, Green Environmental Engineering Co., Ltd.: Professional production muffler \ muffler works Contact: Miss practice 13612784559 QQ: 2890378641 scope of Urban Environmental Noise Standard Classification Table 4-1 Urban Noise classification standard (GB3096-93) category applies Day Evening Ⅰ residents, cultural and educational areas residential, commercial and industrial mixing zone 60 50 Ⅲ industrial zone on both sides of the road 65 55 Ⅳ 70,552 industrial enterprises noise standards 55 45 Ⅱ, field boundary classification Table 4-2 Industrial Enterprises site boundary noise standard classification ( GB12348-2008) category Scope Daytime Nighttime Ⅰ to live, cultural and educational institution dominated area 55 45 Ⅱ residential, commercial, industrial mixed area and commercial district 60 50 Ⅲ Industrial Area 65 55 Ⅳ traffic trunk area on both sides of the road 7055 all kinds of places 3 noise standard form of various types of industrial enterprises within 4-3 Location noise standards of industrial enterprises factory area (GBJ87-85) No. Location Type noise limits dB 1 workshop and workplace (exposure of workers to 8 hours per day) 902 Duty noisy workshop setting, observation room, when the room (indoor background noise level) when there is no telephone communication requirements 75 703 telephone communication requirements of precision assembly, precision machining workshop workplace, computer room (normal operation) 70 4 workshop owned offices, laboratories, design studios (indoor background noise level) 705 master control room, central control room, communications room, telephone switchboard room, fire duty (indoor background noise levels) 606 factory-owned offices, meeting rooms , design studios, central laboratory (including test, testing, measuring chamber) (indoor background noise levels) 607 clinics, classrooms, breastfeeding by, nursery workers Duty (indoor background noise level) 55