Toxicologists have dealt with nanoparticles that are the result of modern human life such as carbon particles in combustion engine exhaust.
Environmental Issues :Two areas are relevant here: (1) In free form nanoparticles can be released in the air or water during production (or production accidents) or as waste byproduct of production, and ultimately accumulate in the soil, water or plant life. (2) In fixed form, where they are part of a manufactured substance or product, they will ultimately have to be recycled or disposed of as waste.
Nanotechnology and Regulators Studies of the health impact of airborne particles are the closest thing we have to a tool for assessing potential health risks from free nanoparticles. These studies have generally shown that the smaller the particles get, the more toxic they become.
References
1. ^ G. Binnig, H. Rohrer (1986). "Scanning tunneling microscopy". IBM Journal of Research and Development 30: 4.
2 Bai (2000). Scanning tunneling microscopy and its applications. New York: Springer Verlag.
3 wikipedia
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