§ Mr. Simon Hughes
To ask the Secretary of State for the Environment if he will list the chlorine loading potential of all CFCs and HCFCs for the time intervals of 10, 20 and 50 years.
§ Mr. Baldry
Chlorine loading potentials, calculated on a steady state emission basis, have been published in report No. 20 of the World Meteorological Organisation global ozone research and monitoring project, "Scientific Assessment of Stratospheric Ozone: 1989", as follows:
Species Chlorine loading potentials CFC-11 1.0 CFC-12 1.5 CFC-113 1.11 CFC-114 1.8 CFC-115 2.0 HCFC-22 0.14 HCFC-123 0.016 HCFC-124 0.04
Species Chlorine loading potentials HFC-125 0.0 HFC-134a 0.10 HFCF-142b 0.14 HFC-143a 0.0 HFC-152a 0.0 CC14 1.0 CH3CC13 0.11
The Montreal protocol scientific assessment, due to be published early next year may provide some time dependent values for either chlorine loading potential or the related ozone depletion potential.