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63-ME4211 - 4 Human Toxicity via Exposure through The...

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4. Human Toxicity via Exposure through The Environment Chemicals emitted as a consequence of human activities can contribute to human toxicity via exposure through the environment . Most important routes of exposure are via the air breathed in or via other materials ingested orally , e.g. as food. If the concentrations of hazardous substances caused by the emission are high enough , the toxic effects can occur immediately after human exposure. This is called acute toxicity. 1
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Toxic effects which appear only on repeated or long-term exposure to the substance are called chronic toxicity . Chronic toxicity is often caused by substances which have only a low degradability in the environment and which therefore persist for a long time after their emission (persistent substances). Some substances also have a tendency to accumulate in the living organisms which function as food for humans. Our food can in this way contain concentrations of substances which are
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