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Nature's nanoparticles

However, nanotechnology might present other risks. Some scientists are concerned that new types of nanoparticles could be bad for the environment and human health.

But nanoparticles already exist in nature: in volcanic ash, ocean spray, forest-fire smoke, clouds and clay. We also create them when we smoke a cigarette or fry our food or drive our cars.

In a busy city like London, we may well be breathing in a million nanoparticles with each breath. So what is all the fuss about?



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Volcanoes are one of the sources of naturally occurring nanoparticles.
Volcanoes are one of the sources of naturally occurring nanoparticles.

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