By KBS LTER volunteer Bill Krasean. Dr. Ying Zhang was a visiting researcher in 2017 in Dr. Phil Robertson's lab at the W.K. Kellogg Biological Station in southwest Michigan. ~~~~ Ozone, the simple combination of three oxygen atoms, is both a naturally occurring and human-created gas in the Earth’s atmosphere. Atmospheric ozone is created naturally from gaseous substances emitted by lightning, soil, and vegetation, but it is also formed from pollutants emitted by human activities. Ozone is a mixed bag whose downside is a growing concern worldwide because of its negative