Addition of undesirable material into the
environment as a result of human
activities
Types of pollution
AIR
Presence of any solid, liquid or gaseous
substance including noise and
radioactive radiation in the atmosphere
in such concentration that may be
injurious to humans and plants.
Suspended
particulate
matter
Dust and soot from industrial
chimneys, power plants, cars,
construction activities, etc
Gaseous
Petrol and diesel as fuel from industries
and cars release gaseous pollutants such
as carbon dioxide, oxides of nitrogen and
sulfur dioxide cause respiratory
problems, and disordes among others.
Prevention and
control of Air Pollution
1. Use cleaner fuels like LNG and biogas.
2. Installing devices like filters,
scrubbers,inertial collectors, etc
3. Environmental friendly industrial processes to minimize
hazardous waste.
NOISE
Any unwanted environmental sound that is generally
considered likely to annoy, distract or even
harm other people. Anything above 80 dB is
hazardous
Indoors
Radio, television, electric
fans and family conflict.
Outdoors
Loudspeakers,
automobiles, traffic,
machines and
industrial activities.
Control and prevention of Noise
Pollution
1. Better design and
maintenance of vehicles.
2. Sound proofing equipment like
generators in industries.
3. Loudspeakers should be prohibited
by night
4. Use green belt trees for noise
absorption.
WATER
The addition of harmful chemicals to natural
water caused by industrial, agricultural and
domestic activities
Sewages with human and animal waste, pesticides like
DDT, metals like lead, zinc, arsenic, copper and
accidents of oil tankers.
Control Water Pollution
1. Waste water recycling for certain uses
with or without treatment.
2. Do not dispose household chemicals or
cleaning agents down the sink or toilet.
3. Run the dishwasher or clothes washer only when you
have a full load to reduce electricity and water usage.
SOIL
The contamination of soil with harmful
substances that can adversely affect the quality of
the soil and the health of those living on it.
Plastic bags, sewages, fly ash, medical
waste, organic matter, etc
Control of soil pollution
1. Stop use of plastic bags, instead use
degradable bags.
2. Treat sewages before using
them as fertilizers.
3. Biomedical waste separately
collected and incinerated.
THERMAL
The rise in the temperature of rivers
or lakes that is injurious to
water-dwelling life
Waste heat generated from electric power plants
and run-off stemming from hot paved surfaces. Use
of water as a cooling agent in natural gas, nuclear
and coal power plants.
Control Thermal
Pollution
1. Store hot water in cooling ponds and allow
it to cool before releasing it
2. Use cooling towers to transfer waste heat to the
atmosphere through evaporation and heat transfer.
3. Recycle waste heat for domestic and industrial heating
purposes. (cogeneration)
RADIATION
Increase in over the natural background radiation
Radioactive minerals, Cosmic rays, Radio nuclides,
Nuclear power plants, Radio-active wastes, Nuclear
explosions, Radio-isotopes, etc
Control Radiation Pollution
1. The disposal of radioactive material must be safe and secure. They
must be stored in the safe places and must be changed into harmless
form.
2. The nuclear power plants must follow all the safe instructions
3. Production of radio isotopes should be minimised.
Pollutants
Physical, chemical and biologica substance
unintencionally released into the
environment which is directly or indirectly
harmful to humans and other living
organisms