WHAT IS POLLUTION?
Pollution is the introduction of contaminants into a natural environment that
causes instability, disorder, harm or discomfort to the ecosystem i.e. physical
systems or living organisms. Pollution can take the form of
chemical substances or energy, such as noise, heat, or light. Pollutants, the
elements of pollution, can be foreign substances or energies, or naturally
occurring; when naturally occurring, they are considered contaminants when
they exceed natural levels. Pollution is often classed as point source or
nonpoint source pollution. The Blacksmith Institute issues annually a list of the
world's worst polluted places. In the 2007 issues the ten top nominees are
located in Azerbaijan, China, India, Peru, Russia, Ukraine, and Zambia.
TYPES OF POLLUTION
One of the serious
disadvantages of the
industrial revolution is the
increased pollution . The
gases and fumes released by
factories and vehicles pollute
the air. Combustion of fossil
fuels, forest fires and
volcanic eruptions are other
major sources of air
[CFCs] damage the ozone
layer in the atmosphere by
the action of the sunlight on
the oxygen molecules.
CFCs have led to the thinning
of the ozone layer.
Rain with high acidic content is called acid rain. It is a
mixture of harmful gases such as HNO3 & H2SO4.
Acid rain has many harmful effects. It causes damage to
marble structure & also promotes corrosion of metallic
Addition of unwanted
wastes in the water bodies
which can change their
characteristics is called
Excessive use of
fertilizers and pesticides
in agriculture leads to
The comic beside shows
how marine animals are
affected by water
• The major cause of water pollution is the discharge
of industrials influents such as oil, grease,
resins, etc. into the water bodies such as lakes,
seas, oceans and ponds.
• More than 5000 animals die every month due to
severe water pollution.
• Land pollution is a term
use to describe how land
is getting exploited day
• Wastes of different
types, and fertilizers
and pesticides have
exploited the land
• The top right diagram
beside shows that 50%
(brown) of land is
The above diagram shows sources of land
1) Atmospheric deposition and acid rain.
2) Direct decomposition from industry and agriculture.
3) Heavy metals can enter food chain from soil.
• Noise pollution (or
environmental noise) is
displeasing human, animal or
machine-created sound that
disrupts the activity or balance of
human or animal life. The word
noise comes from the Latin word
nauseas, meaning seasickness.
• The source of most outdoor
noise worldwide is mainly
construction and transportation
systems, including motor vehicle
noise, aircraft noise and rail
noise. Poor urban planning may
give rise to noise pollution, since
side-by-side industrial and
residential buildings can result in
noise pollution in the residential
• Thus we have seen
how earth is getting
exploited by pollution.
• So its our
responsibility to save