ozono-, ozon-, ozoni-, ozo-, oz- +
(Greek: to smell; stink; generally used in a bad sense)
2. The layer of the upper atmosphere, from 15 to 50 kilometers (10 to 30 miles) above the earth's surface, where most atmospheric ozone collects, absorbing harmful ultraviolet radiation from the sun.
In the 1980's it was realized that industrial pollutants such as CFC's were damaging the ozone layer and that holes had appeared in it, especially over the Antarctic.
CFC refers to a gas containing carbon, hydrogen, chlorine, and fluorine; some forms of which are said to damage the ozone layer in the earth's atmosphere.
2. A situation in which a person's breath has an offensive odor.