ozoné
121Ozone precursors — Chemical compounds, such as carbon monoxide, methane, non methane hydrocarbons, and nitrogen oxides, which in the presence of solar radiation react with other chemical compounds to form ozone. U.S. Dept. of Energy, Energy Information… …
122ozone hole — noun a region of marked thinning of the ozone layer in high latitudes, chiefly in winter, due to CFCs and other atmospheric pollutants …
123ozone layer — noun a layer in the earth s stratosphere at an altitude of about 10 km containing a high concentration of ozone, which absorbs most of the ultraviolet radiation reaching the earth from the sun …
124ozone layer — noun (singular) a layer of gases that prevents harmful radiation (2) from the sun from reaching the Earth: CFCs, the chemicals responsible for the hole in the ozone layer …
125ˈozone ˌlayer — noun [singular] a layer of OZONE in the Earth s atmosphere that protects the Earth from the harmful effects of the Sun …
126ozone hole — o′zone hole n. mer any part of the ozone layer that has become depleted by atmospheric pollution, resulting in excess ultraviolet radiation passing through the atmosphere • Etymology: 1985–90 …
127ozone layer — o′zone lay er n. mer the layer of the upper atmosphere where most atmospheric ozone is concentrated, from about 8 to 30 mi. (12 to 48 km) above the earth …
128ozone depleting substance — noun a chemical, used in fumigation, refrigeration, food treatment, etc., which, if it escapes into the atmosphere, has the ability to reduce the levels of ozone. Abbrev.: ODS …
