2.  Airpollution may be defined as the
presence in the air (outdoor atmosphere)
of one or more contaminants in such
quantities and of such durations as may
be or tend to be injurious to human,
animal or plant life, or property, or
which unreasonably interferes with the
comfortable enjoyment of life or
property or conduct of business.

3.  Itis a substance or effect dwelling
temporarily or permanently in the air ,
which adversely alters the environment
by interfering with the health, the
comfort, or the food chain, or by
interfering with the property values of
people.
 A pollutant can be solid (large or sub-
molecular), liquid or gas .

4.  It may originate from a natural or
anthropogenic source (or both).
 It is estimated that anthropogenic
sources have changed the composition of
global air by less than 0.01%.
 However, it is widely accepted that even
a small change can have a significant
adverse effect on the climate, ecosystem
and species on the planet.
 Examples of these are acid rain, ozone in
the lower atmosphere, and
photochemical smog.

5.  Someprimary air pollutants may react with one
another or with other chemicals in the air to form
secondary air pollutants.

6. Air Quality Index (AQI) Levels of Health
Values Concern
0 to 50 Good
51 to 100 Moderate
Unhealthy
101 to 150
for Sensitive Groups
151 to Unhealthy
200
201 to 300 Very Unhealthy
301 to 500 Hazardous

7. To human
Plants
Animals
Buildings

8.  Premature death
 Aggravated asthma
 Respiratory-related emergency room visits
and hospital admissions
 Acute respiratory symptoms
 Chronic bronchitis
 Decreased lung function (shortness of
breath)

9.  Decrease lung function.
 Irritate lungs.
 Long-term lower level exposures can
destroy lung tissue, leading to
emphysema.
 Children may also be especially
sensitive to the effects of nitrogen
oxides.

10.  Seriously
injure vegetation at certain
concentrations. Effects include:
• Bleaching or killing plant tissue.
• Causing leaves to fall.
• Reducing growth rate.
 Deterioratefabrics and fade dyes.
 Corrode metals (due to nitrate salts
formed from nitrogen oxides).
 Reduce visibility (haze, smog)

12.  Oxides of nitrogen, in the presence of
sunlight, can also react with
hydrocarbons, forming photochemical
oxidants or smog.
 Also, NOx is a precursor to acidic
precipitation, which may affect both
terrestrial and aquatic ecosystems.

13.  Bad odor, it can irritate the respiratory
system.
 Exposure to high concentrations for
short periods of time can constrict the
bronchi and increase mucous flow,
making breathing difficult.

14. Ozone acts as a powerful
respiratory irritant at the levels
frequently found in most of the
nation's urban areas during
summer months.
Ozone exposure may lead to:
• Shortness of breath.
• Chest pain when inhaling deeply.
• Wheezing and coughing.

15.  Clean Air Act
 National Ambient Air Quality
Standards (NAAQS)
 Primary and secondary standards
 Emission Trading Policy

16. Reduce vehicle emissions:
 Drive less
 Keep cars well maintained and tires properly inflated
 Turn off the engine when your vehicle is not in motion
 Purchase low-emitting and fuel efficient vehicles
 Share a ride, take public transportation bike, or walk
 Cut your grass after 6 p.m.
 Refuel your car after 6 p.m.
 Combine errands into one trip

17. Conserve electricity:
 do not over-cool or over-heat buildings
 turn off lights and appliances when not in
use
 Purchase electronics/appliances with
energy star labels