leaf injury of two native grasses, needleandthread (stipa comata trin. && rupr. ) and prairie sandreed (calamovilfa longifolia $left bracket$ hook. $right bracket$ scribn. ), and plains cottonwood (populus sargentii dode) were slightly greater in a downwind direction from a coal-fired power plant in central wyoming injury usually increased with proximity to the power station. a controlled experiment utilizing pinto beans (phaseolus vulgaris l. ) grown within phytometers also indicated greatest leaf injury near and downwind from the power station. elevated levels of fe and fluoride in foliage samples were found for plants growing near the power station and in a downwind direction. however, no significant increases in hg, pb, and cd were found for plants growing near the power plant. significant positive correlations were found for leaf injury and the fe and fluoride concentrations of foliage with average daily sulfation rates. (edited author abstract) refs