ozoné
71ozone layer — ozone .layer n [singular] a layer of gases in the sky that prevents harmful ↑radiation from the sun from reaching the Earth ▪ the hole in the ozone layer …
72ozone hole — ► NOUN ▪ a region of marked thinning of the ozone layer in high latitudes, chiefly in winter, due to CFCs and other atmospheric pollutants …
73ozone layer — ► NOUN ▪ a layer in the earth s stratosphere at an altitude of about 10 km (6.2 miles) containing a high concentration of ozone, which absorbs most of the ultraviolet radiation reaching the earth from the sun …
74ozone-friendly — ► ADJECTIVE ▪ (of manufactured products) not containing chemicals that are destructive to the ozone layer …
75ozone layer — or ozonosphere n. the atmospheric layer within the stratosphere, extending from a height of c. 15 to c. 30 km ( c. 9 to c. 18 mi) and having a heavy concentration of ozone: it absorbs dangerous ultraviolet radiation from the sun and serves to… …
76Ozone depletion — Image of the largest Antarctic ozone hole ever recorded (September 2006) Ozone depletion describes two distinct but related phenomena observed since the late 1970s: a steady decline of about 4% per decade in the total volume of ozone in Earth s… …
77Ozone layer — The ozone layer is a layer in Earth s atmosphere which contains relatively high concentrations of ozone (O3). This layer absorbs 97–99% of the Sun s high frequency ultraviolet light, which is potentially damaging to the life forms on Earth.[1] It …
78Ozone stratosphérique — Couche d ozone Les différentes couches de l atmosphère terrestre …
79Ozone troposphérique — La nocivité du smog est pour partie due à l ozone L ozone (O3) est dit troposphérique (ou « de basse altitude » ou « mauvais ozone ») quand il est situé dans la troposphère. Cet ozone, en tant que superoxydant, est un polluant …
80Ozone Action Day — An Ozone Action Day, which can be declared by a local municipality, county or state, is observed at certain times during the summer months, when weather conditions (such as heat, humidity, and air stagnation) run the risk of causing health… …
