Per Erik Karlsson,^* Håkan Pleijel,^** Helena Danielsson,^*** Gunilla Pihl Karlsson,^**** Kristin Piikki,^***** Johan Uddling<sup>******


*</sup>Per Erik Karlsson is an associate professor in plant physiology. His research interests include variations of air pollutant concentrations and deposition in the landscape and their impacts on forest ecosystems, as well as carbon sequestration by forests. His address: Swedish Environmental Research Institute Ltd, P.O. Box 5302, SE-400 14 Göteborg, Sweden. pererik.karlsson@ivl.se
^**Håkan Pleijel is a professor in applied environmental science. His research interests include the temporal and spatial variation of ozone and other gaseous pollutants in the landscape, as well as the effects of ozone and carbon dioxide on vegetation. His address: University of Gothenburg, Plant and Environmental Sciences, P.O. Box 461, SE-405 30 Göteborg, Sweden. hakan.pleijel@dpes.gu.se
^***Helena Danielsson has a PhD in applied environmental science. Her research interests include impacts of ground-level ozone on vegetation, with a special interest in ozone effects on crops and seminatural vegetation. Her address: Swedish Environmental Research Institute Ltd, P.O. Box 5302, SE-400 14 Göteborg, Sweden. helena.danielsson@ivl.se
^****Gunilla Pihl Karlsson has a PhD in applied environmental science. Her research interests include ground-level ozone and its impact on vegetation, with a special interest in temporal and spatial variations of ozone in the landscape. Her address: Swedish Environmental Research Institute Ltd, P.O. Box 5302, SE-400 14 Göteborg, Sweden. gunilla.pihl.karlsson@ivl.se
^*****Kristin Piikki has a PhD in applied environmental science. Her research interests include the effects of ozone on agricultural crops, the spatial variation of ozone concentration, ozone dynamics, and pedometrics. Her address: Swedish University of Agricultural Sciences, Department of Soil and Environment, Precision Agriculture and Pedometrics, P.O. Box 234, SE-532 23 Skara, Sweden. kristin.piikki@mark.slu.se
^******Johan Uddling has a PhD in environmental science with an emphasis on plant physiology. His research interests include plant physiological ecology and plant-atmosphere interactions. His address: Department of Plant and Environmental Sciences, University of Gothenburg, P.O. Box 461, SE-405 30 Göteborg, Sweden. johan.uddling@dpes.gu.se