Discuss briefly the
Noise pollution

Explanation

Noise pollution : Undesirably high sounds constitute noise pollution. Sound is measured in units called decibles. The human ear is sensitive to sounds ranging form O.to 180 db. O.db is threshold limit of hearing and 120 db is threshold limit for sensation of pain in the ear. Any noise above 120 db is considered to be a noise pollution. A brief exposure to extremely high sound level. 150 db or more generated by jet planes while taking off may damage eardrums causing permanent hearing impairment. Even long term exposure to a relatively higher level of noise of cities may also cause hearing impairment. Noise also causes auditory fatigue, anxiety, sleeplessness (insomnia), increased heart beat, altered breathing pattern thus causing considerable stress to humans.