Identifies & reviews some of the key issues related to assessing the effects of ozone exposure on vegetation. Analyzes information on components of ozone exposure that elicit adverse effects on vegetation, ways to describe these components in the form of ozone exposure indices that may be useful in the standard-setting process for protecting vegetation, the change in nonattainment status that may occur should the existing ozone NAAQS be modified, & the need for future research efforts to explore the development of a suitable multi-parameter index to protect vegetation from ozone exposure.