Box and whisker plots of regional urban and rural trends for the five metrics for 2000–2014. 15 year trends for the five ozone health metrics, a) 4MDA8 (ppb/yr), b) NDGT70 (days/yr), c) SOMO35 (ppb day/yr), d) 3MMDA1 (ppb/yr) and e) AVGMDA8 (ppb/yr). The box indicates the range from the 25^th to the 75^th percentile of the data (or the interquartile range (IQR)). The whiskers extend from those to 1.5 × IQR. Data beyond the whiskers are considered outliers and plotted as points. The line in the box indicates the median, and the point in the box indicates the mean. DOI: https://doi.org/10.1525/elementa.273.f10