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Pollutants To Health: Water is only one of the vehicles that bring chemical pollutants to health into everyday life. The U.S. Food and Drug Administration estimates that Americans are exposed to more than 500,000 substances, usually over very long periods of time. Less than 10% of these substances have been cataloged in a way that would provide useful information concerning their effects on our environment. Slowly developing health hazards are not publicized because they lack the drama that would give them news value. Yet the evidence is now overwhelming that even very low concentrations of environmental pollutants to health can, in time, have disastrous effects through a number of indirect mechanisms.
It is obvious that air pollutants to health soil shirts, penetrate closed windows, irritate the mucous membranes, kill plants, and damage buildings. But oddly enough, it is extremely difficult to prove scientifically that air pollution is really a serious threat to health. An eminent sanitary engineer recently stated that, for all we know, air pollution is more an aesthetic affliction than a health hazard.
Why is it so difficult to demonstrate the danger of air pollutants to health? Because their effects develop slowly and often require decades before they can be diagnosed. Persons may become so used to smog that their behavior and health seem unaffected by contaminated air. However, the respiratory tract registers the insult of the air pollutants to health, even when the affected person is not aware of them. After periods of time that differ from one person to another, and that may extend to two or more decades, the cumulative effects of irritation commonly result in chronic bronchitis, perhaps even cancer. Since such diseases do not become manifest until a long time after initial exposure, it is difficult to relate the effect to its cause.
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