Little is known on what happens when some materials engineered on a nanoscale enter our bodies or escapes into the environment. Berkley is the first city in the word to require from companies that produce nano-sized particles to report to the city council. Chemical giant DuPont joins an environmental group to issue guidelines for nanosafety.
http://www.redherring.com/Article.aspx?a=22692&hed=DuPont+Addresses+Nano-Safety
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