Ozone changes (in ppbv yr–1) for the 95th (top), 50th (middle) and 5th percentile (bottom) values of summer ozone. All sites with at least 10 years of summer data are shown. The colors of the markers represent the value of the slope. Statistically significant trend values (p-value ≤ 0.05) are plotted four times larger than statistically non-significant results. DOI: https://doi.org/10.1525/elementa.300.f7