Ozone layer upper-atmosphere ozone-depletion rate slowed down significantly during the previous decade. Some breakdown can be expected to continue because of ODSs used by nations which have not banned them, and because of gases which are already in the stratosphere. Some ODSs, including CFCs, have very long atmospheric lifetimes, ranging from 50 to over 100 years. It has been estimated that the ozone layer will recover to 1980 levels near the middle of the 21st century. A gradual trend toward "healing" was reported in 2016. Compounds containing C–H bonds (such as hydrochlorofluorocarbons, or HCFCs) have been designed to replace CFCs in certain
Ozone, Tennessee Ozone, Tennessee Ozone is an unincorporated community in Cumberland County, Tennessee, United States. Ozone is the location of Ozone Falls State Natural Area, which was established in 1973 to protect Ozone Falls, a 110-foot (33 m) plunge waterfall, and its surrounding gorge. Ozone is located at (35.88194, -84.80917). The community is situated atop the Cumberland Plateau, roughly five miles west of the plateau's eastern escarpment at Walden Ridge and five miles east of the Crab Orchard Mountains. Fall Creek passes through the western part of Ozone before spilling over Ozone Falls and cutting a gorge that forms the community's southern