Reports, Case Studies & Assessments Preservation Values for Visibility Protection at the National Parks Published 1990 Share SHARE Facebook share Twitter LinkedIn Copy URL Email Download Download 1511251138_NE0117_Using_the_ecosystems_services_approach_to_value_air_quality_0.pdf en Added on: 06 September, 2025 Breadcrumb Home Resource Library Preservation Values For Visibility Protection At The National Parks This document presents the design and results of a study conducted for the U.S. Environmental Protection Agency, the National Park Service, and the University of Colorado concerning the estimation of preservation values held by the general public for the protection of visibility at national parks from air pollution impacts.