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poses a grave threat to humans and the environment.
In many places smoke from factories and cars combines with naturally occurring fog to form smog. Smog has been long recognized as a potential cause of death, especially for elderly persons and those with severe respiratory ailments (like asthma). Air pollution originally resulted from large-scale use of heating fuels (like coal and wood).

Water Pollution

Since the beginning of civilization, water has been used to carry away waste. Rivers, streams, canals, lakes, and oceans are currently used as wastebaskets for every kind of pollution man could create. Water has the capacity to break down or dissolve many materials, but not all materials. Waste materials that can eventually decompose in this way are called biodegradable. They are less of a long-term threat to the environment than are more persistent pollutants such as metals, and plastics. These substances remain in the water and can make it poisonous for many forms of ...

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