“…Cuticular uptake occurs when ozone reacts with compounds on the leaf surface (Potier et al, ; Sun, Moravek, Trebs, et al, ). Water films from dew and rain may enhance cuticular uptake, but there is variability in the response to wetness observed in the field and laboratory (Altimir et al, ; Cape et al, ; Fuentes et al, ; Grantz et al, , ; Lamaud et al, ; Massman, ; Pöschl & Shiraiwa, ; Potier et al, ; Turnipseed et al, ; Zhang et al, ). Previous work suggests that ozone dry deposition to rain‐wet leaves may be low because rain cleanses the leaf surface of substances reactive with ozone (Finkelstein et al, ; Potier et al, ); this may explain some of the observed variability in the response to wetness.…”