IMRAN ZARDARI INSTITUTE OF ENVIRONMENTAL ENGINEERING & MANAGEMENT MEHRAN ENGINEERING UNIVERSITY JAMSHORO SINDH

2. BY
IMRAN ZARDARI
(12IEEM12)

3.  Air pollution is the introduction
of chemicals, particulate
matter, or biological materials that
cause harm or discomfort to humans or
other living organisms, or cause damage
to the natural environment or built
environment, into the atmosphere.

4. 5 Major Pollutants:
1.) Carbon Monoxide
2.) Sulfur Dioxide
3.) Nitrogen Dioxide
4.) Particulate Matter
5.) Ground Level Ozone

5.  Carbon Monoxide
• colorless, odorless
• produced when carbon does not burn in
fossil fuels
• present in car exhaust
• deprives body of O2 causing
headaches, fatigue, and impaired vision

6.  Sulfur Dioxide
• produced when coal and fuel oil are
burned
• present in power plant exhaust
• narrows the airway, causing wheezing
and shortness of breath, especially in
those with asthma

7.  Nitrogen Dioxide
• reddish, brown gas
• produced when nitric oxide combines with
oxygen in the atmosphere
• present in car exhaust and power plants
• affects lungs and causes wheezing;
increases chance of respiratory infection

8.  Particulate Matter
• particles of different sizes and structures that
are released into the atmosphere
• present in many sources including fossil
fuels, dust, smoke, fog, etc.
• can build up in respiratory system
• aggravates heart and lung disease;
increases risk of respiratory infection

9.  Ground Level Ozone
• at upper level, ozone shields Earth from
sun’s harmful UV rays
• at ground level, ozone is harmful pollutants
• formed from car, power and chemical
plant exhaust
• irritate respiratory system and asthma;
reduces lung function by inflaming and
damaging lining of lungs

10.  Sources of air pollution refer to the
various locations, activities or factors
which are responsible for the releasing of
pollutants into the atmosphere.
 Anthropogenic sources (human activity)
 Natural sources

11.  Anthropogenic sources (human activity)
mostly related to burning different kinds
of fuel
"Stationary Sources“
"Mobile Sources“

12.  "Stationary Sources“
› include smoke stacks of power plants
› manufacturing facilities (factories) and waste
incinerators
› as well as furnaces and other types of fuel-burning
heating devices
› traditional biomass burning is the major source of air
pollutants
› traditional biomass includes wood, crop waste

13.  "Mobile Sources“
 include motor vehicles, marine
vessels, aircraft and the effect of sound
etc.

14.  Natural sources
 Dust from natural sources, usually large areas of land with
little or no vegetation
 Methane, emitted by the digestion of food by animals, for
example cattle
 Radon gas from radioactive decay within the Earth's crust.
 Radon is a colorless, odorless, naturally
occurring, radioactive noble gas that is formed from the
decay of radium.

15.  It is considered to be a health hazard
 Radon gas from natural sources can accumulate in
buildings, especially in confined areas such as the
basement and it is the second most frequent cause
of lung cancer, after cigarette smoking
 Smoke and carbon monoxide from wildfires

16.  respiratory infections
 heart disease
 lung cancer
 difficulty in breathing
 Coughing
 Both indoor and outdoor air pollution have caused
approximately 3.3 million deaths worldwide

17.  The following items are commonly used as pollution control
devices
 They can either destroy contaminants or remove them from an
exhaust stream before it is emitted into the atmosphere.
 For Particulate control
 Mechanical collectors
“Dust cyclones & multi cyclones
 Electrostatic precipitators
“An electrostatic precipitator (ESP), or electrostatic air cleaner is
a particulate collection device that removes particles from a
flowing gas (such as air) using the force of an induced
electrostatic charge”

18.  Particulate scrubbers
“Wet scrubber is a form of pollution control
technology. The term describes a variety of
devices that use pollutants from a furnace
flue gas or from other gas streams. In a wet
scrubber, the polluted gas stream is brought
into contact with the scrubbing liquid, by
spraying it with the liquid, by forcing it
through a pool of liquid, or by some other
contact method, so as to remove the
pollutants”

19.  Baffle spray scrubber
 Cyclonic spray scrubber
 Ejector venturi scrubber
 Mechanically aided scrubber
 Spray tower
 Wet scrubber

20. Source:http://en.wikipedia.org/wiki/Air_pollution#Sources