J.: 1998, ‘Ambient ozone effects on forest trees of the eastern United States: a review’, New Phytol. J.: 1994, ‘Foliar injury air pollution surveys of eastern white pine ( Pinus Strobus L.): A review’, Environ. These findings offer a new approach to national air pollution assessments and are intended to help focus research and planning initiatives related to air pollution and forest health.īennett, J. The multivariate analysis showed that the oak-hickory and loblolly-shortleaf pine forest types were generally exposed to more air pollution than other forest types, and the redwood, western white pine, and larch forest types were generally exposed to less. Ozone-induced foliar injury to sensitive species was recorded in all regions except for the Rocky Mountain region. Both the South and Rocky Mountain RPA regions had an increasing trend in ozone exposure. Ozone concentrations were highest in portions of the Pacific Coast RPA region and relatively high across much of the South RPA region. The North and South RPA regions experienced the highest ammonium deposition rates and showed slightly decreasing trends. Nitrate deposition rates were relatively constant for the 1994 to 2000 period, but the South RPA region had a statistically decreasing trend. Estimates of sulfate deposition for forested areas had decreasing trends (1994–2000) across RPA regions that were statistically significant for North and South RPA regions. Results are reported by Resource Planning Act (RPA) reporting region and integrated by forest type using multivariate clustering. We examine trends and the percent forest subjected to specific levels of ozone and wet deposition of sulfate, nitrate, and ammonium. Here we present the major findings from a national scale air pollution assessment that is part of the United States' 2003 Report on Sustainable Forests. Air pollutants pose a risk to forest health and vitality in the UnitedStates.
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