The ozone layer is the layer of air around the earth that helps to regulate the temperature.
An example of the ozone layer is what is being hurt by global warming.
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 harmful ultraviolet radiation from the sun and serves to maintain the temperature of the atmosphere
A region of the atmosphere lying mostly in the stratosphere, between about 15 and 30 kilometers (10 and 20 miles) in altitude, containing a relatively high concentration of ozone that absorbs solar ultraviolet radiation in a wavelength range not screened by other atmospheric components. Also called ozonosphere.