While noise pollution may seem an inevitable side effect of urban life, it need not be so. The sounds of traffic, construction, industry and densely populated areas dominate the soundscape of cities around the world. The sound of oil drills, sonars, or big ships affects marine animals like whales to communicate with each other which hinders their reproductive cycles, feeding habits, and migration, etc.Urban areas are notoriously noisy. They have observed a decline in many marine species. Noise pollution in the seas has been a great concern for scientists lately.
So, the correct answer is ‘(a) Noise pollution.’ The patients may also suffer from sleep disturbances and dementia. Serious ear complications or deafness may occur if sound levels exceed an alarming level of 140 dB for adults and 120 dB for children. Many humans suffer from hypertension due to continuously elevated blood levels in their bodies. Noise pollution can be disastrous for human health. Examples of noise pollution include high decibel sounds at construction sites due to drilling or other heavy machinery, sounds of the airplanes taking off or landing at airports, street traffic or train traffic and loudspeakers, and fireworks at commercial venues, etc. The unwanted sound level above 85dB for 8 hours continuously is considered to be the baseline of the noise pollution. Noise pollution is the continuous exposure to the elevated sound levels that may prove harmful for the health of living organisms. These trees are known to absorb sounds that fall in the frequency range of annoying and irritating sounds for humans. Trees like neem and Ashoka trees are also grown by people living close to such areas in their homes or balcony. In this technique, a belt of the noise- absorbing trees is grown along the roadside or around the areas housing industrial plants. The residential campuses around any such noise- generating areas employ this technique to insulate its residents from noise pollution. The green muffler is a technique employed to reduce noise pollution in areas around industrial plants, highways, along roadsides to block out the excessive sound produced here. The green muffler involves the growth of trees to absorb the element which causes this pollution. Hint: Green muffler plays an important role in curbing a type of pollution that may affect a person’s sleeping pattern or cardiovascular system.
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