The following are acknowledged for information provided: Jim Slusser, Alexander Cede, and Gordon Labow for ozone monitoring data and information on procedures; David Nowak for information on urban tree cover, Jeffrey Walton for information on remote sensing of land cover; Sharon Hanlon, Janie Gordon, and Marianne Butler for information on school programs. Some data collection and analysis was supported by National Science Foundation contributions to the Baltimore Ecosystem Study Long-Term Ecosystem Site under Grant no. DEB-9714835. Richard McKenzie generously shared spectral data used in the chapter by McKenzie and Liley in this volume. I thank Germar Bernhard, William B. Grant, Steven Britz, and an anonymous reviewer for helpful suggestions on the manuscript. Contributions of colleagues Richard H. Grant and Wei Gao over years of research on environmental UV radiation were indispensable.

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