Map of US with pie charts given for major cities (Boston, New York, Philadelphia, Denver, Los Angeles, etc.) showing composition of nanoparticles, including elemental carbon, organic carbon, crustal (soil), nitrate, and sulfate

FIGURE 5-1Four-season average of PM2.5 composition for 15 U.S. cities, 2008

SOURCE: EPA, 2010.

From: 5, Modeling and Simulation of Small Particles

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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