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. 2017 Jul 28;125(7):076002. doi: 10.1289/EHP767

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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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Scatter plot indicating LN personal PM subscript 2.5 exposure in micrograms per meter cube (y-axis) across LN personal C O exposure in parts per million (x-axis) for the nine studies. — Natural log-transformed ${PM}_{2.5}$ personal exposures versus natural log-transformed CO personal exposures plotted for nine unique studies. The Spearman correlation ( $\pm 95 %$ confidence intervals) for all observations ( $n = 714 pairs$ ) is presented at the bottom left of the figure.