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Yosemite National Park Air Resources
Air pollution is currently recognized as one of the most significant threats to the resources of the Sierra Nevada. Sources are local, regional, and in some instances, global. The National Park Service in cooperation with state and other federal agencies are making concerted efforts to reduce the damage caused by air pollution. This is done by an intensive monitoring program, support for research, and expanding the education of park visitors and those concerned about the future of Yosemite National Park.
Air quality has a dramatic impact on visibility in the Yosemite Valley. Move your pointer over the image to see a clean-air day in the Valley. Alternative image here for non-JavaScript browsers.
Maine ocean islands provide the only nesting sites for Atlantic puffins in the United States. Eastern Egg Rock in the midcoast region, Seal Island and Matinicus Rock at the mouth of Penobscot Bay, and Machias Seal Island and Petit Manan Island off the downeast coast provide habitat for more than 4,000 puffins each summer.