Class I Areas Law and Legal Definition

According to the Clean Air Act, a Class I area is one in which visibility protected more stringently than under the national ambient air quality standards and includes national parks, wilderness areas, monuments, and other areas of special national and cultural significance. According to 42 USCS § 7491, congress declared it as a national goal the prevention of any future, and the remedying of any existing, impairment of visibility in class I Federal areas which impairment results from manmade air pollution.