Human Health, Diseases and the Environment: Table-1.A

According to the Government Gazette Notification S.R.O. No. 197-Law/97-

Bangladesh

Environment Conservation Law, 1995, Rule-20, Tafsil No. 4 regarding Sound Levels, as follows:

TAFSIL

Sl No.	Type of Area	Accepted Sound Level Permissible Limit in dB(A)
		Day	Night
a.	Silent Zone	45	35
b.	Residential Area	50	40
c.	Mixed Area (Areas which are chiefly combination of commercial, residential and industrial areas	60	50
d.	Commercial Area	70	60
e.	Industrial Area	75	70

Note:

Time in between 6 a.m. to 9 p.m. is mentioned as day time.
Time in between 9 p.m. to 6 a.m. is mentioned as day time.

Areas around 100 meter diameter of Hospital, Educational Institutions and specific areas recognized by Government are considered as silent zone.

Use of Horn or any other sound related to signal and loud speakers are prohibited in this silent zone

Sound Permissible Limit in Motor Vehicles and Mechanical Water Transport Vessels

Type of Vehicle	Unit	Permissible Limit	Comment
1. Motor Vehicles (all types)	dB(A)	85 100	Measured at 7.5 meter distance from emitting tube Measured at 0.5 meter distance from emitting tube
2. Mechanical Water transport Vessels	dB(A)	85 100	Measured at 7.5 meter distance from water transport vessels at two third of maximum cyclical velocity at weightless and static condition Measured at 7.5 meter distance in the same condition

Motor Vehicle should be kept at static condition and condition of engine should be of following type:

a. Diesel Engine>>Maximum cyclical velocity

b. Engine by Gasoline>>Weight less, acceleration at two thirds of cyclical velocity

c. Motor Cycle>> If cyclical velocity is above the level of maximum 5000 rpm then its two thirds and if cyclical velocity is less than the level of maximum 5000 rpm then it is three fourth.

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