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. 2018 Aug 31;126(8):087004. doi: 10.1289/EHP2732

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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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Map of the USA marking cities with air pollutants PM sub 2.5 and N O sub 2, and PM 2.5 only. — A map of the United States with the cities included in the analysis. The cities with a triangle are cities with both ${PM}_{2.5}$ and ${NO}_{2}$ .