Epidemiology of toxic environmental exposures

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From an epidemiological perspective, why are chronic and pervasive environmental toxicological exposures so difficult to investigate? What factors make these types of exposures difficult to assess, and what makes it so difficult to establish patterns of exposure when the exposure is pervasive in the environment and chronic over a period of time? What methods might an epidemiologist use to try to collect data on this type of exposure?

Reference no: EM1389579

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