"The study of toxic effects of nanomaterials is still under development and many questions are unanswered. Nanoproducts' number grows very rapidly. It is therefore urgent to assess for each of them the likely routes of exposure and the potential toxicity. More research is needed to better understand specific particle properties and other factors that influence their toxicity. New toxicity methods have to be developed and validated. Potential impact on human health and environment should be tested over the entire life-span of the material."

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