Noise Pollution environmental science.ppt

Environmental science topic nose pollution

1. Noise Pollution Dr. Abdul Manan Pathan Centre for Environmental Science University of Sindh, Jamshoro

2. 1. What is Nosie Pollution? Noise pollution , unwanted or excessive  sound  that can have  deleterious  effects on human health, wildlife, and environmental quality. Noise  pollution  is commonly generated inside many industrial facilities and some other workplaces, but it also comes from highway, railway, and airplane traffic and from outdoor construction activities .

3. 2. What are the Causes of noise pollution? Industrialisation:  Industrialisation has led to an increase in noise pollution as the use of heavy machinery such as generators, mills, huge exhaust fans are used, resulting in the production of unwanted noise. Vehicles:  Increased number of vehicles on the roads are the second reason for noise pollution. Events:  Weddings, public gatherings involve loudspeakers to play music resulting in the production of unwanted noise in the nieghbourhood. Construction sites:  Mining, construction of buildings, etc add to the noise pollution .

4. 3. How the noise can be measured? Sound waves are vibrations of  air   molecules  carried from a  noise  source to the ear. Sound is typically described in terms of the loudness ( amplitude ) and the pitch ( frequency ) of the  wave . The measuring unit of noise is dB (Decibel). The normal human  ear  can detect sounds that range between 0  dB  (hearing threshold) and about 140 dB, with sounds between 120 dB and 140 dB causing pain (pain threshold). 

5. 4. What are the Effects on Human Health? P eople repeatedly exposed to more than 105 dBA will have permanent hearing loss to some extent. E xcessive noise exposure can raise  blood pressure  and pulse rates, cause irritability,  anxiety , and mental fatigue, and interfere with  sleep , recreation, and personal communication. Children living in areas with high levels of noise pollution may suffer from  stress  and other problems, such as impairments in  memory  and attention span.

6. 4 . How can we control noise pollution? Honking in public places like teaching institutes, hospital, etc. should be banned. In commercial, hospital, and industrial buildings, adequate soundproof systems should be installed. Musical instruments sound should be controlled to desirable limits. Dense tree cover is useful in noise pollution prevention. Explosives should be not used in forest, mountainous, and mining areas.

7. Thank You