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A byproduct of the
radioactive decay of uranium minerals in certain kinds of rock, radon seeps into
the basements of homes built on these rocks. According to recent estimates by
the U.S. government, 20 percent of the homes in the U.S. harbor radon
concentrations that are high enough to pose a risk of lung cancer.
Each year industrially developed countries generate billions of tons of
pollutants. The level is usually given in terms of atmospheric concentrations
or, for gases in terms of parts per million, that is, number of pollutant
molecules per million air molecules. Many come from directly identifiable
sources; sulfur dioxide, for example, comes from electric power plants burning
coal or oil...
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