Seeing the park land through the haze.Parks and wilderness areas in the United States United States, officially United States of America, republic (2005 est. pop. 295,734,000), 3,539,227 sq mi (9,166,598 sq km), North America. The United States is the world's third largest country in population and the fourth largest country in area. may look clean, but widespread air pollution across the country drastically diminishes visibility in even some of the most remote parklands, according to according to
1. As stated or indicated by; on the authority of: according to historians.
2. In keeping with: according to instructions.
3. "Protecting Visibility in National Parks This is a list of national parks ordered by nation. Africa
Santa Fe Trail - a trail that extends from Missouri to New Mexico; an important route for settlers moving west in the 19th century , people can see only half to two-thirds of the 230-kilometer range that would be possible without pollution. In the east, average visibility is only one-fifth the natural range of 150 kilometers. The vista-diminishing pollution comes from coal-burning power plants, diesel- and gasoline-fueled vehicles, residential and forest fires This is a list of notorious forest fires: North America
Year Size Name Area Notes
1825 3,000,000 acres (12,000 km²) Miramichi Fire New Brunswick Killed 160 people. , and even livestock farms. Sources spread out over hundreds of kilometers contribute to the pollution, which also harms human health.
Congress in 1977 set a goal of reducing haze in large national parks and wilderness areas, but the Environmental Protection Agency Environmental Protection Agency (EPA), independent agency of the U.S. government, with headquarters in Washington, D.C. It was established in 1970 to reduce and control air and water pollution, noise pollution, and radiation and to ensure the safe handling and , the Agriculture Department, and the Interior Department have been slow to carry out their responsibilities for reaching that goal, the report says. In particular, it faults current efforts to improve visibility by targeting just individual polluters, a tactic the National Park Service used in a recent case involving a coal-burning power plant near Grand Canyon National Park. The report calls instead for strategies that consider the various sources in a region that contribute to haze.