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Climate and Atmosphere — Global Gas Concentrations: Methane Units: parts per billion

Reverse years

		1986	1987	1988	1989	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002	2003	2004	2005	2006
World
World {1}		1,618.93	1,628.74	1,636.77	1,657.98	1,663.00	1,675.23	1,691.50	1,690.31	1,693.21	1,700.59	1,701.57	1,708.90	1,717.58	1,727.50	1,728.78	1,728.04	1,728.93	1,729.95	1,729.20	1,728.22	1,725.13

Footnotes

1 - World

1986 data measure average concentrations from May-December only.

2006 data include average concentrations from January to September only.

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: Cunnold, D.M., L.P. Steele, P.J. Fraser, P.G. Simmonds, R.G. Prinn, R.F. Weiss, L.W. Porter, R.L. Langenfelds, H.J. Wang, L. Emmons, X.X. Tie, and E.J. Dlugokencky, In situ measurements of atmospheric methane at GAGE/AGAGE sites during 1985-2000 and resulting source inferences. J. Geophys. Res., 107, 2002.