Visibility Standard

Established by the Colorado State Legislature, the visibility standard requires that not more than 7.6 percent of the light in a kilometer of air be blocked, averaged over four daylight hours. The standard is equivalent to a visual range of 32 miles and was established by the Colorado Department of Public Health and Environment after […]

Established by the Colorado State Legislature, the visibility standard requires that not more than 7.6 percent of the light in a kilometer of air be blocked, averaged over four daylight hours. The standard is equivalent to a visual range of 32 miles and was established by the Colorado Department of Public Health and Environment after assessing public perception and values on visual aesthetics.