Boxplots of the logarithm of exposure to particulate matter of a diameter of 2.5 microns or smaller (PM2.5; μg/M3·min) for (a) morning work commutes, (b) evening work commutes, and (c) all day: New York, NY, October 27, 2008–May 29, 2009.
Note. Five-day averages of each commute are presented. Boxplots depict the 25th and 75th percentiles (edges of the box), the median (line within the box), and the 2.5th and 97.5th percentiles (whiskers) Circles indicate outliers.