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Climate and Atmosphere — Global Gas Concentrations: Methyl chloroform Units: Parts per trillion

Reverse years

		1978	1979	1980	1981	1982	1983	1984	1985	1986	1987	1988	1989	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002	2003	2004	2005	2006
World
World {1}		57.72	63.37	70.50	75.95	82.26	86.12	89.05	93.05	96.96	99.28	103.94	108.04	101.88	113.92	117.27	113.79	107.89	98.21	86.96	75.07	63.90	53.75	45.23	37.80	31.53	26.38	21.89	18.32	15.57

Footnotes

1 - World

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

In 2006, the 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: R. Prinn, D. Cunnold, P. Simmonds, F. Alyea, R. Boldi, A. Crawford, P. Fraser, D. Gutzler, D. Hartley, R. Rosen, and R. Rasmussen. Global average concentration and trend for hydroxyl radicals deduced from ALE/GAGE trichloroethane (methyl chloroform) data for 1978-1990. J. Geophys. Res., 97, 2445-2461, 1992.