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Visual pollution is the visible deterioration and negative aesthetic quality of the natural and human-made landscapes around people. It refers to the impacts pollution has in impairing the quality of the landscape and is formed from compounding sources of pollution to create it. Visual pollution disturbs the functionality and enjoyment of a given area, limiting the ability for the wider ecological system, from humans to animals, to prosper and thrive within it from disruption to natural and human-made habitats. Although visual pollution can be caused by natural sources (e.g. wildfires) the predominant cause comes from human sources as the impact of humanity upon Earth has reached global devastation.
As such, visual pollution is not considered a primary source of pollution, but as a secondary symptom of intersecting pollution sources. Its secondary nature and subjective aspect sometimes makes it difficult to measure and engage with (e.g. within quantitative figures for policymakers), however frameworks for measurement have been established and include public opinion polling and surveys, visual comparison, spacial metrics, to ethnographic work.
Visual pollution can manifest across levels of analysis, from micro instances that effect the individual to macro issues that impact society as a whole. Instances of visual pollution can take the form of plastic bags stuck in trees, advertisements with contrasting colors and content, which create an oversaturation of anthropogenic visual information within a landscape, to community-wide impacts of overcrowding, overhead power lines, or congestion. Poor urban planning and irregular built-up environments contrasting with natural spaces that create alienating landscapes.
The effects of visual pollution have primary symptoms, such as distraction, eye fatigue, decreases in opinion diversity, and loss of identity. It has also been shown to increase biological stress responses and impair balance. As a secondary source of pollution, these also compound with the impact of its primary source such as light or noise pollution that can create multi-layered public health concerns and crisis.
Local managers of urban areas sometimes lack control over what is built and assembled in public places. As businesses look for ways to increase the profits, cleanliness, architecture, logic and use of space in urban areas are suffering from visual clutter. Variations in the built environment are determined by the location of street furniture such as public transport stations, garbage cans, large panels and stalls. Insensitivity of local administration is another cause for visual pollution. For example, poorly planned buildings and transportation systems create visual pollution. High-rise buildings, if not planned properly or sufficiently, can bring adverse change to the visual and physical characteristics of a city, which may reduce said city's readability.
A frequent criticism of advertising is that there is too much of it. Billboards, for example, have been alleged to distract drivers, corrupt public taste, promote meaningless and wasteful consumerism and clutter the land. See highway beautification. Vandalism, in the form of graffiti is defined as street markings, offensive, inappropriate, and tasteless messages made without the owner's consent. Graffiti adds to visual clutter as it disturbs the view.
The process of measuring, quantifying or assessing the level of visual pollution at any place is called the visual pollution assessment (VPA). In past few years, the demand for the methods to assess visual pollution in communities have increased. Recently, Khydija has introduced a tool for visual pollution measurement which can be used to measure the presence of various visual pollution objects (VPOs) and the resultant level of visual pollution 
In the United States, there are several initiatives gradually taking place to prevent visual pollution. The Federal Highway Beautification Act of 1965 limits placement of billboards on Interstate highways and federally aided roads. It has dramatically reduced the amount of billboards placed on these roads. Another highway bill, the Intermodal Surface Transportation Efficiency Act (ISTEA) of 1991 has made transportation facilities sync with the needs of communities. This bill created a system of state and national scenic byways and provided funds for biking trails, historic preservation and scenic conservation.
Businesses situated near an interstate can create problems of advertising through large billboards; however, now an alternative solution for advertisers is gradually eliminating the problem. For example, logo signs that provide directional information for travelers without disfiguring the landscape are increasing and are a step toward decreasing visual pollution on highways in America.