30.
Air pollution happens when wastes dirty the air. People reduce most of the wastes that cause
air pollution. Such wastes can be in the form of gases or particles of solid or liquid matter. These
substances result chiefly from burning fuel to power motor vehicles and to heating buildings.
Industrial processes and the burning of garbage also contribute to air pollution. Besides, there are
other substances that naturally exist in the air. They include dust, pollen, soil particles, and naturally
occurring gases.
The rapid growth of population and industry and the increasing use of automobiles and airplanes
have made air pollutionn a serious problem. The air we breathe has become so filled with pollutants
that can cause health problems. It also harms plants, animals, building materials, and fabrics.
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