5. Air polluction
The pollution is caused by man
a long time. She is a long time in
different ways. Now the whole
world talking about it because it
is a threat to us humans.
6. Sources of air pollution
Sources can be classified into two broad
categories:
•"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.