Air pollution is the unwanted change in quality of the earth’satmosphere caused
by the emission of gases and of particulates, which are small particles, which are small
particles of solid matter or droplets of liquid. Polluted air adversely affects the health of
human beings, animals, and plants; it soils damages building and other property; and its
reduces visibility endangering travel by air and on the ground.
Air pollutants are damaging to a wide variety of materials. Steel becomes
corroded two to four times faster in urban and industrial arean than it does in rural
areas, where muck less coal and oil are burned. When particulates are also present, the
rates of corrosion increase rapidly.
There are small particles such as dust, soot, bacteria and pollen grains. These
particles are part of the air that do not do us harm. However, when large amounts of
these materials and another harmful gases get into air, it is no longer healthy or safe for
living things. We say the air is polluted.
Any substance that decreases the purity of the environment is called a pollutant.
Pollutant can be divided into two broad groups- the particulate and the gases.
Particulates will settle out and fall back to earth somewhere near the source.
The harm that air pollutants give to the human body include asthma and
breathing, chronic lung diseases, greater risk of respiratory infections, worsening of
existing heart and lung conditions, increased incidence of various forms of cancer, and
fetal defects among babies.
Because health is determined by many factors, of which air breathed is just one,
and because of pollutant often acts in combination with others, it is difficult to say with
certainly that a particular pollutant or even by pollution generally. It is possible,