Table 2.93: TABLE 39 Atmospheric carbon dioxide at Mauna Loa, October 2012 to September 2013
Month Carbon
dioxide (ppm)
Month Carbon
dioxide (ppm)
Oct. 391.01 Apr. 398.35
Nov. 392.81 May 399.76
Dec. 394.28 June 398.58
Jan. 395.54 July 397.20
Feb. 396.80 Aug. 395.15
Mar. 397.31 Sept. 393.51
Table 2.93: Source: Dr. Pieter Tans, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, www.esrl.noaa.gov/gmd/ccgg/trends.