Gandhinagar Institute Of Gandhinagar Institute Of TechnologyTechnology

Subject : Environmental Studies

Branch : MECHANICAL [K2]

Prepared By : MAKWANA NIRAV.

Enrollment No : 160120119048

Guided By : Mili Bhavsar

TOPIC : Air Pollution1

Air Pollution

SESSION’S OUTCOME…• AIR POLLUTION AIR POLLUTION

DEFINES...DEFINES...• IT CLASSIFIES…IT CLASSIFIES…• SOURCES OF AIR SOURCES OF AIR

POLLUTIONSPOLLUTIONS• BRIEF IDEA…BRIEF IDEA…• CONTROL TO CONTROL TO

AIR POLLUTIONAIR POLLUTION

AIR POLLUTION DEFINITION

AIR POLLUTION :-Means any solid , liquid, or gaseous substance present in the atmosphere in such concentration as may be or tend to be injurious to human beings or other living creatures or plants or property or environment

AIR POLLUTANT :- the substance which creates pollution is called pollutant

CLASSIFICATION OF AIR POLLUTANTS

A - Classification based on origin of pollutants : 1) PRIMARY POLLUTANT 2)SECONDARY POLLUTANT 1) Primary Pollutant:- - Emitted directly from the sources and are found in the

atmosphere in the form in which they were emitted, like ash, smoke, dust fumes, mist, sprays, radioactive compounds etc

2) Secondary pollutants:- - These are formed in atmosphere by chemical interaction

between primary pollutants and atmospheric constituents, like ozone, peroxyacyl nitrate ( PAN ) , aldehydes, ketones , etc

B – Classification according to the states of matter :

1) GASEOUS POLLUTANTS 2) PARTICULATE AIR POLLUTANTS1) Gaseous pollutants:- - These pollutants are in gaseous state,

like Flourine, Chlorine, SOx, NOx

2) Particulate pollutants:- - They are in suspended form in the atmosphere

These are in the form of dust, smoke, fumes along with natural particulates , like , pollen grains, volcanic dust, fungal spores, protozoa.

SOURCES OF AIR POLLUTANTS SOURCES ARE MAINLY

DIVIDED INTO a) Natural sources :- 1. Dust storms 2. Forest fires 3. Volcanoes 4. Sea spray 5. Plant pollen b) Man made sources :- 1. Domestic 2. Industrial 3. Traffic

a) NATURAL AIR POLLUTANTS

Air pollutants like methane, CO2, H2S etc emitted into atmosphere through biological processes, volcanic eruptions, forest fires

Air pollution from natural sources is a continuous phenomenon because of its cyclic natural processes.

Man’s role is least to control such natural pollution

But he can aggravate such pollution by disturbing natural and ecological balances

b) MAN MADE SOURCES

Point or stationary sources :-Example of point sources is an industrial unit which adds pollutant to air at particular points from their tall chimneys. Pollutants from such point sources affect restricted areas.

Line or mobile sources :- The line or mobile sources of air pollution are the automobile as these add pollutants along a over long distance.

Area sources :- Town & cities add smoke and gases over wide areas and so it is called as area sources of air pollution.

CONTROL OF AIR POLLUTION 1) Selection of suitable fuel

2) Modification in industrial processes and equipments

3) Selection of suitable site and Zoning for industrial unit

4) By using proper environmental impact studies before setting the industry.

5) By using efficient engines.6) By proper maintenance of vehicle

Air Pollution Due To Forest Fires

Air Pollution Due To Vehicles

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