Visibility is a known concept where a measurement of a light or an object can be distinguished. It is in connection to the haze formation in the sky or air that visibility could be affected.
In the past fifty to one hundred years, it would seem that the significant changes had happened in remote areas as well as in the scenic areas.It could then be argued that the importance found in these scenic areas is not merely aesthetic but also due to the preservation of the environmental areas as well as the inhabitants of the wilderness.What impairs the visibility is, as was mentioned above, the haze. It was said that a haze is due to pollutant particles that are come upon by any light rays ("Visibility: Basic Information").
It could be deduced then that the major problem that causes the low visibility is pollution. Air pollution then becomes the notorious problem in air visibility. It was said that the pollution could come from the factories that could be located in several areas in the United States. An example of this is the Grand Canyon.
It was said that the emissions from the power plants along with the angles of the sun could generally affect visibility (Malm "Vision through the Atmosphere" 11-18). Though manmade causes for low visibility are not solely the contributor of visibility but natural causes could also be a contributor.However, it could be argued that the major causes are that of created by man. There were numerous visibility trend watch points that were set up in the United States that could be divided as the Eastern and the Western side (Malm "Particle Concentration and Visibility Trends").
It is seen then that the more sources of pollutants are found within the area, visibility could be impaired. It could also be seen that the most natural causes of visibility changes are the cloud particles but these natural constituents could not have a great impact unlike the man made pollutants that could be found in the air.The significant changes then could be found in the United States would then be found in scenic areas and remote areas that are dominated by power plants or any other pollution causing aspects.Works CitedMalm, William C.
"Particle Concentration and Visibility Trends." Introduction to Visibility, 1999.Malm, William C. "Vision through the Atmosphere." Introduction to Visibility, 1999."Visibility: Basic Information".
2007. September 2007. <http://www.epa.gov/air/visibility/what.html>.
