The gases of atmosphere cannot be seen and we are rarely aware of them. But they are of the greatest importance.
The gases of atmosphere cannot be seen and we are rarely aware of them. But they are of the greatest importance. Without the atmosphere, people, animals and plants could not live. Of almost equal imprtance is the quality of the atmosphere or air – weather it is pure or polluted (impure).
Air contains small amounts of impurities, in rural areas, far from factories and heavy traffic, the air may contain pollen from plants, dust from the soil, and even bacteria. These impurities are in such small amounts that they seem not important.
Air is said to be polluted when it contains enough harmful impurities to effect the health, safety or comfort of living things. The impurities or pollutants could be tiny things. The impurities or pollutants could be tiny particles of matter or gases not normally found in air.
When people breathe, pollutants in the air may be deposited in the lugs or absorbed into the body. Polluted air can harm animals and plants as well as people. For this reason, our air supply should be closely watched and managed to assure its good quality.
There are two main types of air pollution – natural pollution are windblow dust, pollen, fog and the like. There have been instances when the ash from volcanic eruptions has been blown across large areas with smoke. Acts of nature such as these are often beyond human control.