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ENVIRONMENTAL NOISE POLLUTION M.Arivazhagan, Dept of chemical Engg NIT,Trichy .
Why worry about noise? Of all the pollution concerns: Air,water,land, and noise; noise pollution is the one that has the potential for the most damage to humans and wildlife. It is a hidden health hazard that impacts our physical, psychological and intellectual well being. Our ears never shut down, even while we are sleeping, so the input is constant.
Noise Pollution Noise pollution has a broad effect. It can excite us Warn us of danger Soothe us Inspire us Keep us in touch with our surroundings. And, harm our well being.
Source of Noise1.Noise in Industrial Area2.Noise in Residential Area Mechanical devices Voices Musics Neighbors3.Transportation Noise Road Traffic Rail Traffic Air Traffic
Continuation of sources4.Constrution Noise /Public /Military5.Domestic6.Noise from Leisure Activities
Our Magical Ears
What does our ear drum do? Sound waves are collected by our ear canal and passed to the ear drum, which vibrates. The sound waves are then picked up by fluid in the inner ear and passed to the inner ear structures where the acoustic nerve connects to the brain.
The Mighty Decibel Hearing loss can occur from a single exposure to a loud noise or from repeated exposures. The Environmental Protection Agency has set a standard of 70 db in a 24 hour period as safe. Decibels measure the intensity of sound.
The Numbers Rustling leaves- 10db Stereo - 90 db whisper - 30 db bagpipes - 90-110 db normal speech - 60 db power saw - 100 db television - 70 db fire cracker - 115-120 db traffic - 75-80 db blow dryer - 85 db rock concert - 120 db noisy hall - 85 db gunshot/train/jet - 150 db classroom - 85 db
How much is too much? Damage to health begins at 75 db. Hearing damage begins at 90 db and can be permanent with one exposure of 120 db or more. The average decibel levels at Montpelier High School are 70-86; where damage to physical, psychological and communicative health begins.
Sound Level Meter Type 1 Precision Sound Level Meter Type 2 General Purpose Sound Level Meter Type 3 Survey Sound Level Meter Type 4 Special Purpose Sound Level Meter
Auxiliary Equipment of the Sound Level Meter Calibrator Octave Band Filter Set Wind Screen Impulse Network Graphic Level Recorder
Types and Measurement Procedure
Noise control Reducing the Sound Producer Interrupting the Path of the Source Protecting the Recipient
Industrial Noise Control Community Noise Noise in the Home
Controlling the noise in your life is not hopeless, but doesrequire determination on your part to respect and alter the levelof noise. Wear ear plugs in Increase trees and very loud places. shrubs around Filtered ear plugs, property. such as Sonic II can Be aware of your be purchased in any surroundings and do music or gun shop. whatever you can to They reduce the reduce the noise level. damaging decibels, Find quiet time daily. whereas foam plugs Carpeting, pictures will muffle sound but and plants will absorb still allow too high a sound. decibel range to Limit your time in a enter your ears. noisy environment
Under Sea Noise Pollution Severe threat to the Marine organisms/ Eco system Low Frequency Activities Sonar (LFAS) Covers 80% World Ocean Detect Submarine Noise (240db)
Ambient noise standardsArea code category Limits in dB Day NightA Industrial area 75 70B Commercial area 65 55C Residential area 55 45D Silence zone 50 40Figure in parenthesis are percentage
Sources of noise affecting male and female Respondents(Narendra Singh et al, 2004 )Noise sources Male FemaleLoud speaker 64(82) 57(79)Automobiles 52 (67) 52(67)Neighborhoods 38(49) 35(49)Religious 42(54) 47(65)functions 78(100) 72(100)Total respondentsFigure in parenthesis are percentage
Effect of nosie on different age groupsEffect of 0-20 20-40 40-60 Above Total 60noiseEffect on hearing 23(68) 28(57) 34(79) 22(92) 107(71)Interfere withcommunication 33(97) 47(96) 41(95) 20(83) 141(94)Cause annoyance 25(73) 38(78) 35(81) 18(75) 116(77)Disturb sleep 33(68) 46(94) 41(95) 22(92) 132(88)Result in 9(26) 15(31) 15(35) 13(54) 52(35)Deafness 8(23) 17(35) 17(40) 8(32) 50(32)MentalBreakdownTotal 34(100) 49(100) 43(100) 24(100) 150(100) Figure in parenthesis are percentage
Suggestion by different (age group) respondents Suggestion Total Education 50(33) Government Efforts 33(22) Involving NGO’S 26(17) Empowering police 18(12) Empowering Civil Authorities 23(15) Total 150(100) Figure in parenthesis are percentage
Remedies Administrative remedies Judicial Remedies Legislative Remedies Public Co-operation International Co-operation
References Environmental Noise Pollution , Patrick F.Cunniff,John Wiley & Sons (1977) Narendra Singh et al ,Noise pollution Sources , Effects & Control , J.Hum.Ecol, 16(3):181-187(2004) Noise and You by JOAN FITCH RN/B.S.N Environmental Engineering Ruth F.Weiner, Fourth edition Butter worth& Heinemann (2003)