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For most of the environmental health risk is far lower than these which are easily calculated. We are not talking about countable public health risk, e.g. benzin in the air released from petroleum and leukemia. There is no question that people exposed to high levels of benzin at workplace have is a risk for leukemia. What is the risk in much lower levels? One thing we want to make clear is that we can not count it. We can not verify in most of the risk assessment.