Figure 3: Prunus serotina showing typical stipple damage due to high levels of ozone exposure. (Photo courtesy of Schaub, M., Jakob, P., Bernhard, L., Innes, J.L., Skelly, J.M., Kräuchi, N. 2002. Ozone injury database. http://www.ozone.wsl.ch. Swiss Federal Research Institute WSL, Birmensdorf.)