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. 2019 Jul 24;127(7):077007. doi: 10.1289/EHP4438

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EHP is an open-access journal published with support from the National Institute of Environmental Health Sciences, National Institutes of Health. All content is public domain unless otherwise noted.

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Figure 1 is a map of the United States showing mean pollution by U.S. Census Tract (average concentrations of PM subscript 2.5 ranging between 3.4 and 16 and above) from 1999 to 2015. — Average concentrations of ${PM}_{2.5}$ pollution ( ${μ g / m}^{3}$ ) by 2010 U.S. Census tracts in the continental United States, 1999–2015. ${PM}_{2.5}$ , particulate matter $< 2.5 μ m$ in aerodynamic diameter.