13.4.1 Sources of Noise Pollution

. . Sources of Noise Pollution Vehicle engines, air horns, audio video systems, trains, low flying aircrafts, factory machines, sirens, motors, drillers and crushers, compressor machines, crackers, explosives, modern supersonic transports are the common sources of noise pollution. The threshold of pain is about db. World Health Organization has proposed that noise must be recognized as a major threat to human well-being. This is applicable for all living organisms. XII Std Zoology Chapter XII Std Zoology Chapter Environmental Issues • Inhalation of contaminated air can cause respiratory problems. • Consumption can lead to poisoning, side effects and after effects. • Chemicals can cause skin rashes and irritation of eyes. • Many of these chemicals are reported to be carcinogenic. • They can trigger hormonal disorders and neurotoxicity. • Beneficial insects and animals can be affected.