Ninety percent of the ozone in the atmosphere is found in the stratosphere, a layer of atmosphere between about 10 and 50 kilometers in altitude. The amount of ozone in the atmosphere varies with time ...

"The measurements report dichloromethane at an altitude of 10-12km - this is still the troposphere," said Dr Susan Strahan from Nasa. "To demonstrate that it is a threat to ozone requires ...

According to their analysis, during the El Niño phase, ozone concentrations close to the Equator are anomalously low at a pressure level of 70 hPa, corresponding to an altitude of about 18–20 km.

The ozone layer, which protects us from ultraviolet light, looks to be successfully healing after gaping holes were discovered in the 1980s. The Northern Hemisphere could be fully fixed by the ...