is a form of pollution that affects us all but is unlike other forms of
pollution. Once the noise stops, the pollution immediately comes to an
end and the environment is free of it. Other forms of pollutant
such as sewerage and chemicals, are always difficult to remove such as from
water, soil and air.
classification of noise is always a difficult subject. For some, the
sound of a Grand Prix race is thrilling and gives enjoyment to many whereas,
to others it is annoying and constitutes a nuisance. The same is
typical of loud music. Many younger people among us enjoy listening to
music set at high volumes when it infuriates others. So noise is
subjective, in some ways it is enjoyed by some but for others, is an
unwelcome form of noise pollution such as hearing your neighbours television
when you are quietly reading a book.
now well known that excessive noise is a danger to health. It can
cause stress, sleeplessness, annoyance and many other uncomfortable
guide to how noise is measured is shown in the table below.
drill at 3 metres
Threshold of pain
can see from the table, anything over 80dB in volume is very uncomfortable
and can impair hearing. Lower volumes of noise can also be annoying if
it is disturbing, particularly at night. Normally there are two ways
to reduce noise nuisance. One is to eliminate the noise at source,
giving instant relief or if this is not possible, introduce soundproofing to
reduce the noise nuisance.
travels as spherical ripples through the air much like the ripples created
on a pond after a stone has been thrown in. As the ripples travel
further away from their source, they reduce in intensity and if they hit a
solid barrier or hit reeds, their energy is split up and dissipated in much
the same way as soundproofing materials work.
Page still under