To inform visitors about visibility impairment at the Grand Canyon. To provide information about the pollutant species affecting visibility at the canyon, about pollution sources, and about changes in seasonal visibility conditions at the canyon. To provide information about what can be done to help reduce air Pollution in the canyon. Air pollution affects Grand Canyon views much of the time. Grand Canyon's air pollution appears as haze which limits how far and how clearly you see.
Sulfates also combine with precipitation to form acid rain.
Some distant features disappear from view. The haze largely results from pollution. Both photos were taken at about the same time of morning from the museum roof. Air pollution at Grand Canyon comes from both nearby and distant sources. Seasonal weather patterns and local meteorological conditions determine how the contribution of each source changes over time.