Drawing of a scale with human production of nanoparticles on one side (indicated by photo of a factory) and natural production of nanoparticles (indicated by an image of the Earth) on the other side. The natural production (100s of Tg/yr) far outweighs the human production (<<1 Tg/yr), indicated by a tipping of the scale

FIGURE 2-9An inventory of human versus natural production of nanoparticles

From: 2, What Are Small Particles and Why Are They Important?

Cover of Challenges in Characterizing Small Particles
Challenges in Characterizing Small Particles: Exploring Particles from the Nano- to Microscale: A Workshop Summary.
National Research Council (US) Chemical Sciences Roundtable.
Washington (DC): National Academies Press (US); 2012.
Copyright © 2012, National Academy of Sciences.

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