Working Group I: The Scientific Basis


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II.2.10: CFCs and HFCs abundances from WMO98 Scenario A1(baseline) following the Montreal (1997) Amendments (ppt)
Year CFC-11 CFC-12 CFC-113 CFC-114 CFC-115 CCl4 CH3CCl3 HCFC-22 HCFC-141b HCFC-142b HCFC-123 CF2BrCl CF3Br EESCl
1970 50 109 4 6 0 56 13 13 0 0 0 0 0 1.25
1975 106 199 9 8 1 77 36 25 0 0 0 0 0 1.54
1980 164 290 18 10 1 92 75 41 0 0 0 1 0 1.99
1985 207 373 34 12 3 100 102 64 0 0 0 2 1 2.44
1990 258 467 67 15 5 102 125 90 0 1 0 3 2 2.87
1995 271 520 86 16 7 100 110 112 3 7 0 4 2 3.30
2000 267 535 85 16 9 92 44 145 13 15 0 4 3 3.28
2010 246 527 81 16 9 75 6 257 22 33 2 4 3 3.03
2020 214 486 72 15 9 59 1 229 16 32 3 3 3 2.74
2030 180 441 64 15 9 47 0 137 9 23 2 2 3 2.42
2040 149 400 57 14 9 37 0 88 6 17 2 1 3 2.16
2050 123 362 51 14 9 29 0 46 2 11 1 1 3 1.94
2060 101 328 45 13 9 23 0 20 1 6 1 0 2 1.76
2070 83 298 40 13 9 18 0 9 0 4 0 0 2 1.62
2080 68 270 36 12 8 14 0 4 0 2 0 0 2 1.51
2090 56 245 32 12 8 11 0 2 0 1 0 0 2 1.41
2100 45 222 28 12 8 9 0 1 0 1 0 0 1 1.33

Notes: Only significant greenhouse halocarbons shown (ppt).
EESCl = Equivalent Effective Stratospheric Chlorine in ppb (includes Br).
[Source: UNEP/WMO Scientific Assessment of Ozone Depletion: 1998 (Chapter 11), Version 5, June 3, 1998, Calculations by John Daniel and Guus Velders guus.velders@rivm.nl & jdaniel@al.noaa.gov]

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