Read full article: Bedford Regional Water Authority ... Congress amended the Clean Air Act in 1977 to make restoring and maintaining visibility a goal for 156 national parks, wilderness areas ...

Congress amended the Clean Air Act in 1977 to make restoring and maintaining visibility a goal for 156 national parks, wilderness areas, wildlife refuges and tribal reservations across 36 states. That ...

Congress amended the Clean Air Act in 1977 to make restoring and maintaining visibility a goal for 156 national parks, wilderness areas, wildlife refuges and tribal reservations across 36 states.