ozone depletion

ozone depletion

1. Beware the radicals

   • ODP (Ozone Depletion Potential)
     • the relative amount the breakdown to the ozone layer cause by the substance
     • compared with CFCl3
   • ozone
     • stable balance between photochemical production and loss
     • introduction of new compounds
       • ozone loss
       • disruption of natural equilibrium
       • cholrine radicals
         • by human activity
         • come from CFCs
           • only be brown down by UV light
     • radicals
       • initiation
         • propagation
           • termination
       • single CFC
         • destroy 100,000 ozone molecules
     • nitrogen oxide destroys ozone

2. regulation

   • countries ban CFCs
   • Montreal Protocol
     • steps to control global emissions of CFC
     • HCFCs and HFCs to replace CFCs