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Climate and Atmosphere — Global Gas Concentrations: Carbon tetrachloride Units: Parts per trillion

Reverse years

		2006	2005	2004	2003	2002	2001	2000	1999	1998	1997	1996	1995	1994	1993	1992	1991	1990	1989	1988	1987	1986	1985	1984	1983	1982	1981	1980	1979	1978
World
World {1}		90.05	90.89	91.76	92.33	93.20	94.21	95.12	96.10	97.07	98.16	98.96	99.91	100.91	101.40	102.15	101.92	102.34	101.08	100.63	99.84	98.23	96.80	95.09	93.65	92.78	90.34	89.82	87.94	88.33

Footnotes

1 - World

In 1978, annual average only includes the months of July through December.

In 2004, annual average only includes the months of January through September.

Source

Carbon Dioxide Information Analysis Center (CDIAC), Environmental Sciences Division, Oak Ridge National Laboratory. 2007. ALE / GAGE / AGAGE Network Data on Concentrations of Greenhouse and Ozone-depleting Gases. Available online at http://cdiac.ornl.gov/ftp/ale_gage_Agage/ Data originally reported in: Simmonds, P.G., Cunnold, D.M., Weiss, R.F., Prinn, R.G., Fraser, P.J., McCulloch ,A., Alyea, F.N., and O'Doherty, S. 1998. Global trends and emission estimates of CCl4 from in situ background observations from July 1978 to June 1996. Journal of Geophysical Research, 103 (D13), 16017-16027.