Author: Robert D. Rowe
Publisher: Routledge
Published: 2019-03-04
Total Pages: 335
ISBN-13: 0429696930
DOWNLOAD EBOOK →This book is an outcome of the Visual Values Workshop in 1982. It presents the ongoing research on state-of-the-art techniques and applications to address the human perception of changes in visual aesthetic resources and to assign psychological, social, and economic measures of value to visitors.
Author: Dee Morse
Publisher:
Published: 2004-02-01
Total Pages: 59
ISBN-13: 9780756739164
DOWNLOAD EBOOK →Discusses the current quality of air in our national parks, which visitors expect to be clean and clear. Monitoring conducted in national parks over the past 20 years documents that, in most parks, air quality is better than standards set by the EPA to protect public health and welfare. In addition, air quality is improving or remaining stable in about half the parks where monitoring occurs. Chapters: Preserving Air Quality in National Parks; Current Air Quality Conditions and Trends; Measuring Air Quality in National Parks; Great Smoky Mountains National Park -- Threatened by Air Pollution; The Future of Air Quality in Our National Parks; and Data Tables. Color photos and maps.
Author: Timothy J. Sullivan
Publisher: CRC Press
Published: 2017-02-03
Total Pages: 683
ISBN-13: 1498765181
DOWNLOAD EBOOK →A variety of air pollutants are emitted into the atmosphere from human-caused and natural emissions sources throughout the United States and elsewhere. These contaminants impact sensitive natural resources in wilderness, including the national parks. The system of national parks in the United States is among our greatest assets. This book provides a compilation and synthesis of current scientific understanding regarding the causes and effects of these pollutants within national park lands. It describes pollutant emissions, deposition, and exposures; it identifies the critical (tipping point) loads of pollutant deposition at which adverse impacts are manifested.
Author: United States. Congress. House. Committee on Interior and Insular Affairs. Subcommittee on National Parks and Recreation
Publisher:
Published: 1986
Total Pages: 594
ISBN-13:
DOWNLOAD EBOOK →Author: United States. Congress. House. Committee on Interior and Insular Affairs. Subcommittee on National Parks and Public Lands
Publisher:
Published: 1993
Total Pages: 208
ISBN-13:
DOWNLOAD EBOOK →Author: Timothy Joseph Sullivan
Publisher: CRC Press
Published: 2017
Total Pages: 0
ISBN-13: 9781498765176
DOWNLOAD EBOOK →15.4.3 Modeling Studies
Author: Christine Shaver
Publisher: Forgotten Books
Published: 2017-10-23
Total Pages: 110
ISBN-13: 9780265649800
DOWNLOAD EBOOK →Excerpt from Air Quality in the National Parks: A Summary of Findings From the National Park Service Air Quality Research and Monitoring Program The purpose of this report is to summarize findings from the nps air quality research and monitoring program based on data collected through 1987. This information helps the National Park Service to remedy and prevent resource degradation so that future generations can enjoy the parks in as natural a condition as possible. Visibility monitoring has shown that. In addition to natural sources of visibility impairment. There are varying degrees of visibility impairment from manmade pollution in virtually all monitored parks. Nps research findings suggest that fine sulfate particles are the single most important contributor to visibility impairment in most nps units. Fine sulfate particles, which can be transported long distances in the atmosphere. Are primarily the result of sulfur oxide emissions from energy and industrial sources. In the Colorado Plateau area. Where Grand Canyon National Park and several other nps units are located, fine sulfate particles are responsible for 40 to 60 percent of the visibility impairment. In eastern areas of the country. Fine sulfates play an even larger role in visibility impairment. In the Pacific Northwest. Sulfates are not the primary cause of visibility impairment; instead. Fine carbon from controlled burning of timber and agricultural land and natural forest fires plays a prominent role. Research on effects of visibility on the visitor experience in five nps units indicates that clean. Clear air is one of the most important features of these parks. It appears that visitors value an environment undisturbed by man above all other features of the parks. Research findings on the effects of changes in visual air quality suggest that a small increase in air pollution is more easily noticed and more disturbing to the human observer when the atmosphere is initially relatively clean. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: National Research Council
Publisher: National Academies Press
Published: 1993-02-01
Total Pages: 465
ISBN-13: 0309048443
DOWNLOAD EBOOK →Scenic vistas in most U.S. parklands are diminished by haze that reduces contrast, washes out colors, and renders distant landscape features indistinct or invisible. Protecting Visibility in National Parks and Wilderness Areas describes the current understanding of the nature and extent of haze in various regions of the United States. The book addresses the scientific and legal framework of efforts to protect and improve visibility, as well as methods for assessing the relative importance of anthropogenic emission sources that contribute to haze in national parks and for considering various alternative source control measures. The volume provides guidance on how to make progress toward the national goal of correcting and preventing visibility impairment due to human activities affecting large national parks and wilderness areas.