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. 2018 Oct 15;126(10):107002. doi: 10.1289/EHP3304

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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 2 is a box-and-whisker plot, plotting year and number of participants (y-axis) across PM sub 2.5 in micrograms per cubic meter (x-axis). — Distribution of baseline ${PM}_{2.5}$ exposure of the participants by year. Boxes cover the 25–75th percentile (interquartile range: IQR) with a center line for the median concentration. Whiskers extend to the highest observation within 3 IQRs of the box, with more extreme observations shown as circles.