noise ppt

Noise Pollution

What is Noise?In simple terms, noise is simply unwanted sound.

Sound is a form of energy which is emitted by a vibrating body and on

reaching the ears causes the sensation of hearing

through nerves.

A noise problem generally consists of three inter-related elements:-

- the source, - the receiver and - the transmission path

Path

Source Receiver

Noise may be continuous or intermittent. Noise may be of high or low frequency

whichever is undesired for a normal hearing.

Types Of Noise :-

The differentiation between noise and sound also depends upon-

- the habit and interests of the person/species, - the ambient conditions, - impact of sound.

Noise Measurement

The intensity of sound is measured in Sound Pressure Levels(SPL) and the common unit of measurement is decibel, dB.

Sources of Noise

Domestic Sources - Movement of utensils

- From Television sets. - From Music Systems.

PACHE HAT BE!!

Natural Sources - Shores, birds and

animal shouts. - Wind movement,

sea tide movement, - Waterfalls

Commercial Sources

- Vendor Shouts, automobiles, aero planes, marriages, laboratory, machinery etc.

Industrial Sources Generator sets,

boilers, plant operations, trolley movement, transport vehicles, pumps, motors etc.

Examples of Sound Levels

• Soft whisper-30dB • Normal conversation-50-60dB • Subway, city traffic, alarmclock, and

factories-80dB • Chainsaw, stereoheadphones, andnightclub-

100dB • Sound at rock concert infront of speakers -

120dB • Gunshot or jet plane-140dB • Rocket launching-180dB

Impact of Noise

Why bother about Noise?

Annoyance Physiological Effects Loss of hearing Cardiovascular problems Increase in B.P Damage Nervous System Sleeplessness Hypertension Tinnitus (perception of sounds

even in absence of any external sounds)

AMa miaan!

Control of Noise Pollution

The techniques employed for noise control can be broadly classified as

- Control at Source - Control in the transmission path - Using protective equipment

Control at Source

Reducing the noise levels from Domestic Sectors.

Maintenance of automobiles.

Speaking softly. Prohibiting loudspeakers. Maintenance of machines

Control in the transmission path

Installation of barriers.

Design of Building - Installation of

panels or enclosures.

- Green Belt Development.

Using protective equipment

Ear muffs, ear plugs

Whether knowingly or unknowingly, everyone of us contribute to noise pollution.

Identify the sources of noise pollution.

Efforts should be made to reduce the undesired noise levels from (unwanted) noise generating sources.

Its high time that everyone should do this bit in curbing the noise pollution, which is otherwise becoming as effective as SLOW POISIONING.

Reference:

1. www.google.co.in 2. www.wikipedia.org