In Bhopal, India, in December 1984, a release of methly isocyanate from a pessticide plant killed about 2500 people. Similar leakages of hydrogen sulfide from natural gas processing plants have killed houndreds of people. These tragic events attract wide attention.
Their effects dont result from a single exposure these gases but from repeated exposure to low concentration for long periods.
If we wish to establish the dose-response curve for a pollutant gas, we have 3 possible approaches; animal experiments, loboratory experiments with humans and epidomiological studies of human populations.
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