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註釋This study develops a preliminary estimate of the commercial forestry benefits resulting from long range air pollution control. Two alternative pollution control options are evaluated against a base case in which no further pollution control measures are implemented. The first program of additional controls and regulations simply maintains long range air pollution at recent (1984) levels into the indefinite future. The second program of controls and regulations is much more extreme and can achieve a 50% reduction in long range air pollution levels by 1994 and maintain these new lower pollution levels into the indefinite future. These control programs reflect a subjective assessment of the feasible range of policy options. Noncommercial forestry values are unevaluated and annual tree-cropping activities are not taken into consideration. The relationship between the percentage changes in forest productivity under the alternative pollution scenarios and future commercial harvest rates is also investigated.