2. OUTLINE
WHAT IS NOISE ?
HAZARDOUS NOISE
TYPES OF NOISE
NOISE POLLUTION
TYPES OF NOISE POLLUTION
SOURCES OF NOISE POLLUTION
EFFECTS OF NOISE POLLUTION
CONTROLS OF NOISE POLLUTION
3. WHAT IS NOISE ?
The word noise comes from the Latin word ‘’nausea’’ meaning
"injury" or "hurt".
Noise is an unwanted, unpleasant and annoying sound caused by
vibration of the matter.
4. HAZARDOUS NOISE
‘’Sounds louder than 60-80 decibels are considered potentially very
dangerous.. Hair cells of the inner ear and the hearing nerve can be
damaged by an intense brief impulse.’’
5. TYPES OF NOISE
There are four types of noise which are following:
Continuous Noise: It’s noise that is produced continuously by
machinery that keeps running without interruption.
Intermittent Noise: is a noise level that increases and decreases rapidly.
This might be a freight train passing by, factory equipment that operates
in cycles or aircraft overhead.
(Wikipedia)
6. TYPES OF NOISE
Impulsive Noise is most commonly associated with the construction
and demolition industry. This sudden burst of noise can startle you by
its fast and surprising nature. Impulsive noises are commonly created
by explosions or construction equipment such as pile drivers.
Low frequency Noise makes up part of the fabric of our daily
soundscape. Whether it’s the low background humming from power
plants or the roaring of large diesel engines. This is also the hardest
type of noise to reduce at source, so it can easily spread for miles
around.
(Wikipedia)
7. MEASUREMENT OF NOISE
“A decibel is the standard unit of Noise”
20 dB is whisper.
40 dB the noise in a quiet office.
60 dB is normal conversation.
80 dB is the level at which sound becomes physically painful. And
can be termed as noise.
(Noise Pollution, Health Services Management Centre, England)
9. NOISE POLLUTION
“Noise pollution or environmental noise is displeasing human-,
animal- or machine-created sound that disrupts the activity or
balance of human or animal life.”
10. TYPES OF NOISE POLLUTION
1. Industrial Noise: is sound with a high intensity sound caused by industry
machines.
2. Transport Noise: mainly consists of traffic noise from road, rail and aircraft.
3. Neighborhood Noise: includes disturbance from household gadgets and
community. Common sources being musical instruments, TV, VCR, Radios,
Transistors, Telephones, and loudspeakers etc.
11. NOISE POLLUTION IN PAKISTAN
In Pakistan, unfortunately there is no legislation to deal with the noise
emanating from railway engines, aircraft or airport or industrial or construction
activities.
In Pakistan, noise pollution increases day by day, specially in Karachi and
Lahore city.
At present, there are no national standards for prescribing noise limits for
residential areas, industrial areas, commercial areas or silence zones.
Creation of an unnecessary noise has to be prohibited and should be
punishable under law which is made by the Pakistan Environmental Protection
Agency.
(NOISE POLLUTION, Pakistan Environmental Protection Agency)
12. NOISE POLLUTION IN PAKISTAN
No national survey has been conducted to assess the noise level
in cities.
However, random tests in different cities showed that the noise
level in most of the areas was a high as 70 to 90 Db.
The government should pass the ‘Noise Pollution Control Act’ to
meet special Pakistan condition.
(NOISE POLLUTION, Pakistan Environmental Protection Agency)
13. SOURCES OF NOISE POLLUTION
Road Traffic noise
Air Craft
Noise from railroads
Construction Noise
Noise in Industry
Noise in building
Noise from Consumer products
Loud Speakers / Public Address Systems
Firecrackers
14. SOURCES OF NOISE POLLUTION
ROAD TRAFFIC NOISE
In the city, the main sources
of traffic noise are the motors
and exhaust system of autos,
smaller trucks and buses.
Road noise, especially at some
distance from the road can be
described as a steady state
noise that does not fluctuate
much.
AIR CRAFT NOISE
Now-a-days , the problem of
low flying military aircraft has
added a new dimension .to
community annoyance, as the
nation seeks to improve its
nap-of the- earth aircraft
operations over national
parks.
15. SOURCES OF NOISE POLLUTION
NOISE FROM RAILROADS
Noise from railroads, rail car
retarders can produce a high
frequency. high level screech that can
reach peak levels of 120 dB at a
distance of 100 feet, which translates
to levels as high as 138, or 140 dB at
the railroad worker’s ear.
CONSTURCTION NOISE
The noise from the construction of
highways, city streets, and buildings
is a major contributor to the urban
scene. Construction noise sources
include pneumatic hammers and air
compressors.
16. EFFECTS OF NOISE POLLUTION
Hearing Problems
Health Issues
Sleeping Disorders
Cardiovascular Issues
Trouble Communicating
Effect on Wildlife
17. EFFECTS OF NOISE POLLUTION
Hearing Problems: Any unwanted sound that our ears have not
been built to filter can cause problems within the body. Our ears
can take in a certain range of sounds without getting damaged.
Health Issues: Excessive noise pollution in working areas such as
offices, construction sites, bars and even in our homes can
influence psychological health.
Sleeping Disorders: Loud noise can certainly hamper your
sleeping pattern and may lead to irritation and uncomfortable
situations
(Effects of Noise Pollution, Katherine Bryant, USA)
18. EFFECTS OF NOISE POLLUTION
Cardiovascular Issues: Blood pressure levels, cardio-vascular
disease and stress related heart problems are on the rise.
Trouble Communicating: High decibel noise can put trouble
and may not allow two people to communicate freely. This may
lead to misunderstanding and you may get difficult understanding
the other person.
Effect on Wildlife: Wildlife faces far more problems than
humans because noise pollution since they are more dependent on
sound. Animals develop a better sense of hearing than us since
their survival depends on it.
(Effects of Noise Pollution, Katherine Bryant, USA)
19. CONTROLS OF NOISE POLLUTION
Construction of sound proof rooms for noisy machines in industries.
Every motor vehicle shall be fitted with a device (silencer).
Noise producing industries, aerodromes, and railway stations to be
shifted away from the inhabited areas.
Avoid or limit time spent in noisy sports events.
(Noise Pollution Control, Narendra Singh,Haryana,India)
20. CONTROLS OF NOISE POLLUTION
Proper law should be enforced to check the misuse of
loudspeakers and public announcements systems. Loud speakers
are banned from 10pm to 6am.
Proper oiling will reduce noise from the machine.
Before buying a home, see how far it is from the local airport.
Installation of Noise barriers on the roads.
(Noise Pollution Control, Narendra Singh,Haryana,India)
21. NOISE REDUSING TECHNOLOGIES
Installation of barriers between the noise source
and the receiver
Use of acoustics in the design of building such as
double glazing
Installation of panels or enclosures
Green belt development such as the attenuation of
sound levels by plantation of trees and shrubs can
22. REFERENCES
CH-7 European Green Capital Award Nantes 2012 2013.
Noise Pollution- Sources, Effects and Control, Narendra Singh and S.
C. Davar,2004,Haryana,India.
Effects of Noise Pollution, Katherine Bryant, USA.
Noise Pollution, Health Services Management Centre, England
Viewed 30 July 2107,Noise Pollution, www.conserve-energy-
future.com/causes-and-effects-of-noise-pollution.php
