That blog post is a bit on the inflammatory side. It's not all nanoparticles, it's the silver ones. Actually nanoparticles are pretty pervasive in the environment. The silver ones are not. After looking into it a bit it does seem that use of nanoparticle silver on an industrial scale is ramping up. At this time it's hard to know what effects will be. While I don't think that it should be stopped in an immediate sense, studying it more might not be a bad idea.
It's kind of ironic. Nanoparticle silver has been an alternative medicine for just about forever. It's known as colloidal silver. Never heard anything bad about it then, only now that it's getting more widespread use.
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