Chapter 9 Noise Pollution Introduction

Pollution:

The harmful and unwanted substances make the environment unsafe, unhealthy, and hazardous for living organisms. The phenomenon of harming the environment is called pollution.

‘Noise’ means as any loud or unpleasant or undesired sound. £o ‘Noise’ can be defined as any sound that causes annoyance. It also can be a source of pollution.

Noise Pollution

The excessive or disturbing noise that can harm our normal activities or damage the balance of human or animal life can be said to be ‘noise pollution’.

“WBBSE class 6 physical geography chapter 9 notes”

The sound level above 80 decibels becomes intolerable and it causes noise pollution. The intensity of sound is measured by a unit which is called ‘Decibel’. A ‘decibel’ or ‘sound level meter’ is a basic tool that measures the intensity of sound.

Read and Learn  More WBBSE Notes For Class 6 Junior School Geography

Natural sources of noise pollution :

There are many kinds of sounds in nature. Some natural phenomena like thunder, volcanic eruptions, waterfalls, landslides, and avalanches can be noisy too. But their effect is localized and persists for a short duration.

Man-made sources of noise pollution :

High-decibel noise is generated mainly from man-made sources such as horns, sirens, television, radio, loudspeakers, food- mixers, washing machines, lawnmowers, etc.

“WBBSE class 6 geography chapter 9 key points”

Some sources of noise pollution in villages :

Noise pollution is comparatively less in villages. However, natural sources of noise pollution like thunder, landslides, the use of tractors and generators in the field, the sound of construction work, use of loudspeakers during festivals and public functions often break the silence of nature.

Class 6 History	Class 6 Social Science
Class 6 Geography	Class 6 Science
Class 6 Maths	Class 6 Science MCQs
Class 6 General Science	Class 6 Maths Solutions
Class 6 Geography	Class 6 Hindi

Some sources of noise pollution in cities or urban areas :

The sources of noise pollution in cities or urban areas are far more than in the village areas.

The sources of noise pollution in urban areas as follows :

The number of vehicles in cities is more and the degree of commotion is also more. So, people in cities are exposed to the constant blaring of horns, and screeching of tires as buses, trucks, motorcars and other fast-moving vehicles try to overtake each other during busy hours.

The landing and take-off of airplanes, and helicopters can cause serious noise pollution to the residential complexes located at the vicinity of airports.

Loudspeakers, musical bands, and bursting of crackers at different public functions during festivals disrupt the peace and quietness of the environment.

“important questions from noise pollution class 6”

In the cities, the building of skyscrapers is a common feature. As the construction sites of the multistoried buildings, the noise produced by different machines and construction tools poses a serious problem in the nearby areas.

Poor urban planning may give rise to noise pollution If residential and industrial buildings are situated side by side then it can result in noise pollution in residential areas.

It should be noted that the explosion of nuclear or atomic bombs and the sound of bullets during military training in open areas can also cause temporary noise pollution.

The intensity of different sounds (decibel level) dB :

Effects Of Noise Pollution

The effects of noise pollution can be divided into auditory effects and non-auditory effects. Auditory effects encompass fatigue and deafness. Non-auditory effects can be understood by a noise of 50 dB to 60 dB.

“noise pollution WBBSE class 6 geography notes”

Interfering with speech. Even a low level of sound of considerable duration causes annoyance, high blood pressure, nausea, fatigue, anxiety, etc. All these lead to a loss of working efficiency.

The important effects of noise pollution may be described as follows :

Continuous and loud noise disturbs our thought process, and we lose concentration. As a result, our quality of work, as well as our efficiency, gets lowered.

The capability to hear can get reduced or loss of hearing gradually as a result of noise pollution.

“effects of noise pollution on human health class 6”

Continuous and monotonous sounds of machines and construction tools may be -irritating, tiring, and painful. It can cause nausea, unconsciousness, and even. severe headache when it crosses the tolerance level.

It can also cause hypertension, high blood pressure, heart disease, fatigue, insomnia, eye ailments, ulcers, vertigo, nerve disorders, and gastric and digestive problems.

Noise disturbs sleep. Lack of sleep causes nervous disorders and irritability.

Firecrackers may upset wild or domestic animals or can traumatize individuals.

Control Of Noise Pollution

Noise Pollution can be controlled if we take the following measures :

• Implementation of laws can control the menace of noise pollution.
• Government policies should be strictly implemented in order to control noise pollution.
• Laws should be implemented strictly to maintain silence in areas near hospitals and educational institutions.
• ‘Silence’ boards should be hung near schools, libraries, hospitals, etc. in order to restrict people from making noise in these areas.
• Playing of loudspeakers and bursting of crackers should be restricted to a bearable limit. (65 dB).
• Silencing the noise-producing engines such as engines of air-crafts, auto-mobiles, machinery in factories and home appliances could help.
• Machinery and tools to be oiled to keep them mobile to reduce noise.
• The old noisy machines should be replaced by the new ones.

“summary of class 6 physical geography chapter 9 WBBSE”

• Industrial location should be away from the residential areas. To do this, proper urban planning is necessary.
• High levels of noise can be reduced by covering the room walls with acoustic tiles which act as sound absorbers.
• The industrial machinery making noise should be confined to soundproofed enclosures.
• Devices to reduce sound intensity are used in cinema halls, community halls ‘ or auditoriums.
• We can save ourselves from harmful noise pollution by using earplugs.
• Persons, especially the workers employed in noise-prone areas should be given protective devices such as ear plugs and ear muffs.
• Since natural vegetation has a tremendous ability to absorb and dissipate sound ~ energy, trees should be planted along highways and industrial areas to reduce noise.

WBBSE Notes for Class 6 Junior School Geography