June through July Ozone Clock

Below are a few "Ozone Clocks" for June and July 2015 from measurement stations around northern Utah. These should convince you that the best time to exercise outside out be in the morning when ozone pollution is always low. The afternoon and evening hours ozone concentrations are frequently higher. You can create your own ozone roses and clocks on my website here: http://home.chpc.utah.edu/~u0553130/BB_home/cgi-bin/ozone_rose.cgi