Nanopollution

Nanopollution is a generic name for all waste generated by nanodevices or during the nanomaterials manufacturing process. This kind of waste may be very dangerous because its size. It can float in the air and might easily penetrate animal and plant cells causing unknown effects. Most human made nanoparticles do not appear in nature so living organism may not have appropriate means to deal with this kind of waste.

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http://en.wikipedia.org/wiki/Nanopollution