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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
(pursuant to his answer, 10 December 1991, c. 363]: 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 |
| HFC-22 | 0·14 |
| HCFC-123 | 0·016 |
| HCFC-124 | 0·04 |
| HFC-125 | 0·0 |
| HFC-134a | 0·0 |
| HCFC-141b | 0·10 |
| HCFC-142b | 0·14 |
| HFC-143a | 0·0 |
| HFC-152a | 0·0 |
| CCl4 | 1·0 |
| CH31CCl3 | 0·11 |