Noise Pollution: Definition, Types, Causes, Examples, Effects, Control

What is Noise Pollution?

Noise pollution may be defined as sounds that are considered undesirable noise. These noises interfere with normal human health and ecosystem situations. The common sources of noise pollution are from traffic, industrial equipment, and urban activities, affecting both the urban and rural regions. So the analysis of noise pollution is important since it contributes to the deterioration of health, biodiversity, and general well-being.

Cause of Noise Pollution

Noise pollution has many sources. It comes from natural causes like thunder, wind and animal sounds. But the main cause of noise pollution is man-made. These sources create loud sounds that disturb sleep and biodiversity.

The most common causes of noise pollution are:

Natural sources

Natural sources of noise pollution include:

• Weather: The noise can be caused by thunder and hurricanes, by wind.

• Wildlife: In particular settings, animals may vocalise, and natural environments may make a noise.

Anthropogenic (Man-Made) Sources

Anthropogenic sources are predominant contributors to noise pollution:

Transportation:

• Constant noise without breaks

• Examples: highway traffic, industrial machinery

• Causes long-term health effects such as stress and hearing loss

Industrial activities:

• Machinery and heavy equipment

• Factories and manufacturing plants

• Construction and demolition sites

Urbanisation:

• Machinery and heavy equipment

• Factories and manufacturing plants

• Construction and demolition sites

Types of Noise Pollution

Noise pollution appears in different forms. The types of noise pollution are continuous, intermittent, impulsive, and low‑frequency noises. Each type has unique sources and health effects.

The types of Noise Pollution are described below-

Continuous Noise

• Constant noise without breaks

• Examples include highway traffic, industrial machinery

• Causes long-term health effects such as stress and hearing loss

Intermittent Noise

• Occurs at random intervals

• Examples include noises like construction works and other loud events in periods

• Interferes with sleep and is a source of short-term annoyance and possibly health consequences.

Impulsive Noise

• Loud sounds that are sharp, sudden and brief in nature

• Includes loud explosions, gunshots or bangs and shutting of doors.

• Can lead to instantaneous headaches, stress, and hearing loss, especially when one stays in areas close to industrial or construction areas.

Low-Frequency Noise

• Infrasound is included in low-frequency noise, since people cannot hear it, although it influences health and well-being.

• Emitted by such objects as large mechanical equipment, air conditioning systems, and certain industrial activities.

• Creates vibrations that interfere with sleep and produce stress effects.

Effects of Noise Pollution on Humans, Wildlife and Ecosystem

Noise pollution has serious impacts. The health effects of noise pollution include hearing loss, stress, sleep disturbance, and heart problems. The environmental impact of noise pollution is also high, disturbing wildlife behaviour and damaging ecosystems. In cities, there is urbanisation and noise pollution that together reduce the quality of life, while industrial noise pollution from machines and factories lowers the productivity of the ecosystem and community well‑being.

The effects of Noise Pollution are described below-

Health Effects

• Hearing loss: Repeated loud noise causes a hearing disorder or even complete loss of hearing, depending on the extent of exposure to such noise levels.

• Cardiovascular issues: Some of the effects of constant noise exposure include hypertension, an increase in heart rate and other cardiovascular ailments.

• Sleep disturbances: Hearing disturbance results in the inability to sleep, sleep deprivation, and overall irritability of the body system.

• Stress and mental health impact: Contact with noise over a period may result in anxiety and irritability, and may be a cause of mental health disorders such as depression.

Environmental Effects

• Wildlife disturbance: Light pollution changes the behaviour of the animals it affects, including the reactions to other animals, feeding times, and reproduction rates.

• Ecosystem impact: This is so because noise affects the various forms of life – marine and terrestrial – within their various ecosystems to an extent that could lead to species loss or shift to other areas or forms of existence.

Social And Economic Effects

• Productivity loss: Researchers state that productivity in noisy environments is low mainly due to distraction, deviation of concentration and mistakes in meetings.

• Quality of life degradation: Nuisance noise reduces the quality of life for citizens and has hurt community satisfaction and house prices within such environments.

Major Sources of Noise Pollution in Daily Life

Noise pollution comes from many daily sources. The major sources of noise pollution include transportation, industrial activities, construction, urbanisation, and household appliances. These sounds disturb health, sleep, and focus, and they also affect wildlife and ecosystems.

Noise pollution originates from various sources, including:

Prevention and Control of Noise Pollution

Noise pollution may be responsible for excessive or harmful levels of noise in the environment. This may become a serious threat to human health and wildlife. The effective control measures of noise pollution include strategies for diminishing and managing noise effectively.

• Urban Planning: Apply zoning laws that prevent residential areas from being near noisy industrial areas.

• Noise Barriers: Set up barriers to block or absorb road and industrial site noises.

• Vehicular Controls: Implement noise emission limits for vehicles and promote quieter engines and quieter tyres.

• Soundproofing: Soundproof buildings use soundproof materials for noise reduction.

• Public Awareness: Educate the public about the effects of noise pollution and promote quieter behaviour.

• Noise Control at Source: Quietening of engines, plants, and machinery, along with frequent servicing, that is, keeping them in good working order, will help reduce the noise.

• Green Spaces: Increase green spaces within urban areas to serve as noise buffers, absorbing sound.

Noise Pollution NEET MCQs (With Answers & Explanations)

Important questions asked in NEET from this topic are:

• Causes of noise pollution

• Effects of noise pollution

Practice Questions for NEET

Q1. dB is a standard abbreviation used for the quantitative expression of

1. The density of bacteria in a medium

2. A particular pollutant

3. The dominant Bacillus in a culture

4. A certain pesticide

Correct answer: 2) A particular pollutant

Explanation:

In India, the Air (Prevention and Control of Pollution) Act was implemented in 1981 concerning air pollution. It is amended by the law, 1987, noise is an air pollutant, a level of undesired loud sound that negatively affects humans and the surrounding environment. In this legislation, the prevention and control of these different air pollutions of various sorts are considered important.

Hence, the correct option is 2) A particular pollutant.

Q2. The loudness of a sound that a person can withstand without discomfort is about

1. 150 dB

2. 215 dB

3. 30 dB

4. 80 dB

Correct answer: 4) 80 dB

Explanation:

The loudness of sound that humans typically find comfortable is around 120 decibels. Beyond this threshold, discomfort sets in, and sound may become painful. With each 10-decibel rise, the intensity of the sound amplifies exponentially. At approximately 130 dB, the sound reaches the threshold of pain, which is not only unpleasant but can also induce physical discomfort. Prolonged exposure to such high levels can result in hearing damage or loss.

Hence, the correct answer is option 4) 80 dB.

Q3. The major source of noise pollution worldwide is due to:

1. Office equipment

2. Transport system

3. Sugar, textile and paper industries

4. Oil refineries and thermal power plants

Correct answer: 2) Transport system

Explanation:

With the advent of trade, commerce, and industry, there is a significantly high importance of the usage of transport. This can be the last step toward executing goods or services in a given type of trade or industry. An effective system of transportation brings products to the consumers directly from the producers. This enhances the overall economic activity, which brings further development for that economy as a whole.

Hence, the correct answer is option 2) transport system.

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