Methyl halides are the primary carriers of halogens between the biosphere and the atmosphere, and therefore play an important role in the effects of halogens on the chemistry of atmosphere, hence on the integrity of the ozone layer. Methyl bromide (CH 3Br) and methyl chloride (CH 3Cl) are both generated mainly from natural processes. These gases can reach the stratosphere where these halogen atoms can be released through photolysis and destroy ozone through catalytic reactions. Methyl iodide plays an imp...