关键词：大气；空气污染；环境保护
摘 要：Critical Issues in Aviation and the Environment 2014 consists of 12 individually authored sections, representing the authoring experts opinions on issues that address the major environmental components affected by aviation activities, sustainable solutions that have evolved and continue to be developed to minimize environmental impacts, and the key processes that link aviation and the environment. As in past versions, the focus of this e-circular is on the state of science, rather than policy, and on identification of priority research with potential to yield benefits during the next several years to several decades. This e-circular focuses on research conducted in the United States, although international activities are discussed where public or private entities in this country are closely involved. A wide range of published and unpublished material, public information, and individual contributions was collected to prepare these papers, as noted in the additional resources at the end of each section. Due to scope constraints, the critical issues portions of each section do not necessarily address all potentially critical issues in a given field.