Although visibility impairment is as well understood as any other air-pollution effect, gaps in knowledge remain. Filling these gaps will require an increased national commitment to visibility protection research. We believe that the time has come for Congress, EPA, and the states to decide whether to make that commitment.
The National Academies of Sciences, Engineering, and Medicine
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"7 Conclusions and Recommendations."
Protecting Visibility in National Parks and Wilderness Areas.
Washington, DC: The National Academies Press, 1993.
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