-=> ROBERT SAYRE wrote to WAYNE CHIRNSIDE <=-

 WC> I thought it was because it drifted into the ozone layer where it
 WC> worked as a catalyst to break down the protective ozone layer.

 RJT> I understand that this is the rationale that's been given in some
 RJT> cases,  but it makes no sense to me why the "ozone hole" that was
 RJT> reported should only show up over the south pole.

 RS>  The "ozone hole" can only be produced when the
 RS> temp is below -80øC. This first step is necessary
 RS> to "prepare" the CFC's to change into clorine.

 RS>  This is also why the "holes" are only present
 RS> during certain months of the year.


I didn't know the exact chemistry but knew well that certain conditions
were required to liberate the clorine at altitude as clorine
being as reactive as it is would never make it to the ozone layer
were it liberated from CFC's at low altitude temperatures and conditions.
 
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