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The reporter under contract for reporting depositions is generally not the same reporter under contract for reporting Tax Court proceedings . Compounding the problem of acid deposition is the fact that deposition is not just due to pollutants emitted locally . These models suggest that in areas where atmospheric deposition of N is moderately high , as is true over most of the northeastern United States , an average of 40 percent of that deposition is exported from the landscape to downstream ecosystems . Anyone who reads or watches that deposition knows the President was in fact trying to do precisely what he has admitted - - to give the lawyers grudging , unresponsive or even misleading answers without actually lying . The Great Waters provisions , added to the Act in 1990 , require U.S. EPA to monitor air deposition and conduct an assessment of the extent to which that deposition is responsible for environmental or human health effects or exceedences of water quality standards . A National Centers for Coastal Ocean Science scientist recently reported that nitrogen deposition from the atmosphere is increasing and that the chemical form of that deposition is shifting towards ammonium in coastal North Carolina . Moreover , that deposition has to occur over a long period of time . A literature study of controlled experiments revealed that acidifying deposition mediates increasing N and S concentrations , and decreasing Mg : N and Ca : Al ratios in the needles .