This is a very thorough and accessible article on the subject for the layperson; however, registration with the site is javascript required:
... the development of applications for nanotechnology is rapidly outpacing what scientists know about safe use. The unusual properties that make nanoscale materials attractive may also pose unexpected risks to human health and the environment, according to scientific literature on the subject.
Nanotechnology: Great potential but unknown risks - chicagotribune.com.

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About Tom Usher
Mini-Biography: Vision for the Organization: (We must bring forth fruits worthy of repentance. The giving and sharing economy is the right system for running the whole household of Heaven and Earth.) Arcticles: (Thousands of online articles.) Employment: (2007 - Present: President: RLCC.) (1995 - Present: Independent contracting; Website developing; Writing.) (1993 - 1995: Factors International/Bradbury Hill International Finance.) Education: (City University, Olympia: Bellevue. Graduate Studies: Public Administration. Organizational Theory/Design.) (Arizona State University. BS, Political Science.) (Northern Arizona University.)