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5475159 
Journal Article 
No equatorial divide for a cleansing radical 
Fiore, AM 
2014 
1 
Nature
ISSN: 0028-0836
EISSN: 1476-4687 
513 
7517 
176-178 
English 
Reactions with OH also prevent some substances from destroying the stratospheric ozone layer. Since the OH molecule was first confirmed to exist in the troposphere more than 40 years ago1, a clear depiction of its spatial distribution has been elusive. The production of methyl chloroform was banned by the Montreal Protocol, so only residual emissions remain. Because the rate at which it is lost from the atmosphere through reactions with OH now exceeds the emission rate, methyl chloroform can be used to infer OH levels more accurately than ever before3. 
Environmental Studies; Environmental regulations; Chemistry; Atmosphere; Pollutants; Free radicals