Noise pollution and its control BY Muhammad Fahad Ansari 12IEEM14

Noise Pollution

PRESENTED BY: Muhammad Fahad Ansari 12IEEM14

Noise is an unpleasant / unwanted sound Sound is a form of energy which is emitted by a Vibrating

body and on reaching the ear causes the sensation of hearing through nerves. Sounds produced by all vibrating bodies are not audible.

The frequency limits of audibility are from 20 HZ to 20,000 HZ.

Types of noise Continuous Impulse

Side effects of noise Loss of hearing Stress Accidents Behavioural effects Noise Hazard Symbol Negative impact on health

Loud noises can cause hearing loss Long time exposure to a harmless

noise can cause hearing loss Damage from hearing loss is

irreversible Noise induced hearing loss is

preventable Prevention involves:

NOISE CONTROLS SAFE WORK PRACTICES EDUCATION AWARENESS

Chiller Operation Compressor Operation Street traffic Constructions Consumer products Others more sources.

There are about 25000 hair cells in our ear which create wave in our ear, responding to different levels of frequencies.

With increasing levels of sound the cells get destroyed decreasing our ability to hear the high frequency sound.

Effects of noise to inner ear

Normal hair cells Noise-damaged hair cells

Hair cells in the inner ear transmit noise signals to the brain.

It has already been stated that continuous exposure to noise pollution leads to hearing impairment but it has various other effects as well which are as follows:

It can result into increase in blood pressure Increased stress Fatigue (Low Energy / Weakness) Sleep disturbance Annoyance (Irritation / Frustration) Speech Problems Aggression (Anger / Violent Behavior) Anxiety (Nervousness / Disquiet)

DECIBEL SCALE

Bulldozer: 85dBAQuite Room: 30 dBA

Normal Conversation: 50 dBA

Normal City Noises: 65 dBA

Artillery/Good Rock Band: 120 dBA

it is considered necessary to regulate and control noise producing and generating sources with the objective of maintaining the ambient air quality standards in respect of noise.

Objectives Protect workers from risks to their hearing caused by noise. Prevent hearing loss and deafness as a result of exposure to

noise at work. Legal requirements placed on employers

Identify noise problems and if noise levels are above 85dB(A), measurements must be taken and assessed by a competent person. Such measurements should be repeated at appropriate intervals.

To be Continue .........

SCHEDULE (see rule 3(l) and 4(l)Ambient Air Quality Standards in Respect of Noise

DAY NIGHT

(A) Industrial area 75 70(B) Commercial area 65 55(C) Residential area 55 45(D) Silence Zone 50 40

Note: 1. Day time shall mean from 6.00 a.m. to 10.00 p.m.

2. Night time shall mean from 10.00 p.m. to 6.00 a.m

Three ways to protect your hearing: Engineering controls Administrative controls Hearing protection Like PPE.

ENGINEERING CONTROLS

Enclosure between source and receiverSound barriersComplete enclosureSound proof cabinsEquipment and exhaust

Display “High Noise Area” Poster Display PPE Awareness Poster Regular PPE Inspection Decreasing the exposure time Limiting the number of

personnel exposed Arranging a work roster system

Description How to fit

and wear Advantages Disadvantage

s

“EAR PLUGS”

Painless and short test to measure hearing

Establishes a baseline Detects changes in hearing Employee’s with exposure in excess of

85dB(A) over an 8 hour period

Know the source of harmful noise Use engineering and administrative

controls to avoid exposure to noise Obey posted high noise area signs Wear hearing protection properly

Thanks for your attention