Co2 Mlo Monthly Noaa Esrl

7/27/2019 Co2 Mlo Monthly Noaa Esrl

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CO2 Measurement & Analysis http://www.esrl.noaa.gov/gmd/ccgg/about/co2_measurements.html

NOAA MLO Weekly Data: http://www.esrl.noaa.gov/gmd/ccgg/trends/weekly.html

Scripps MLO Monthly Data: http://scrippsco2.ucsd.edu/data/atmospheric_co2.html

Related Datasets
http://www.esrl.noaa.gov/gmd/ccgg/about/co2_measurements.htmlhttp://www.esrl.noaa.gov/gmd/ccgg/trends/weekly.htmlhttp://scrippsco2.ucsd.edu/data/atmospheric_co2.htmlhttp://scrippsco2.ucsd.edu/data/atmospheric_co2.htmlhttp://www.esrl.noaa.gov/gmd/ccgg/trends/weekly.htmlhttp://www.esrl.noaa.gov/gmd/ccgg/about/co2_measurements.html


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Trend

Decimal Average Interpolated (seasonally Data

Year Month Date CO2 CO2 corrected) Days

1958 3 1958.2080 315.71 315.71 314.62 -1

1958 4 1958.2920 317.45 317.45 315.29 -1

1958 5 1958.3750 317.50 317.50 314.71 -1

1958 6 1958.4580 -99.99 317.10 314.85 -11958 7 1958.5420 315.86 315.86 314.98 -1

1958 8 1958.6250 314.93 314.93 315.94 -1

1958 9 1958.7080 313.20 313.20 315.91 -1

1958 10 1958.7920 -99.99 312.66 315.61 -1

1958 11 1958.8750 313.33 313.33 315.31 -1

1958 12 1958.9580 314.67 314.67 315.61 -1

1959 1 1959.0420 315.62 315.62 315.70 -1

1959 2 1959.1250 316.38 316.38 315.88 -1

1959 3 1959.2080 316.71 316.71 315.62 -1

1959 4 1959.2920 317.72 317.72 315.56 -1

1959 5 1959.3750 318.29 318.29 315.50 -1

1959 6 1959.4580 318.15 318.15 315.92 -1

1959 7 1959.5420 316.54 316.54 315.66 -1

1959 8 1959.6250 314.80 314.80 315.81 -1

1959 9 1959.7080 313.84 313.84 316.55 -1

1959 10 1959.7920 313.26 313.26 316.19 -1

1959 11 1959.8750 314.80 314.80 316.78 -1

1959 12 1959.9580 315.58 315.58 316.52 -1

1960 1 1960.0420 316.43 316.43 316.51 -1

1960 2 1960.1250 316.97 316.97 316.47 -1

1960 3 1960.2080 317.58 317.58 316.49 -11960 4 1960.2920 319.02 319.02 316.86 -1

1960 5 1960.3750 320.03 320.03 317.24 -1

1960 6 1960.4580 319.59 319.59 317.36 -1

1960 7 1960.5420 318.18 318.18 317.30 -1

1960 8 1960.6250 315.91 315.91 316.92 -1

1960 9 1960.7080 314.16 314.16 316.87 -1

1960 10 1960.7920 313.83 313.83 316.76 -1

1960 11 1960.8750 315.00 315.00 316.98 -1

-99.99 means 'missing data' | -1 means the number of data days is not available

Latest update by NOAA-ESRL: September 5, 2012

Atmospheric CO2 | NOAA-ESRL

Monthly Mean Concentrations at the Mauna Loa Observatory (PPM)Scripps data from March 1958 - April 1974 | NOAA-ESRL data since May 1974

This CO2Now worksheet uses NOAA data posted at ftp://ftp.cmdl.noaa.gov/ccg/co2/trends/co2_mm_mlo.txt.


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1960 12 1960.9580 316.19 316.19 317.13 -1

1961 1 1961.0420 316.93 316.93 317.03 -1

1961 2 1961.1250 317.70 317.70 317.28 -1

1961 3 1961.2080 318.54 318.54 317.47 -1

1961 4 1961.2920 319.48 319.48 317.27 -1

1961 5 1961.3750 320.58 320.58 317.70 -1

1961 6 1961.4580 319.77 319.77 317.48 -11961 7 1961.5420 318.57 318.57 317.70 -1

1961 8 1961.6250 316.79 316.79 317.80 -1

1961 9 1961.7080 314.80 314.80 317.49 -1

1961 10 1961.7920 315.38 315.38 318.35 -1

1961 11 1961.8750 316.10 316.10 318.13 -1

1961 12 1961.9580 317.01 317.01 317.94 -1

1962 1 1962.0420 317.94 317.94 318.06 -1

1962 2 1962.1250 318.56 318.56 318.11 -1

1962 3 1962.2080 319.68 319.68 318.57 -1

1962 4 1962.2920 320.63 320.63 318.45 -1

1962 5 1962.3750 321.01 321.01 318.20 -1

1962 6 1962.4580 320.55 320.55 318.27 -1

1962 7 1962.5420 319.58 319.58 318.67 -1

1962 8 1962.6250 317.40 317.40 318.48 -1

1962 9 1962.7080 316.26 316.26 319.03 -1

1962 10 1962.7920 315.42 315.42 318.33 -1

1962 11 1962.8750 316.69 316.69 318.62 -1

1962 12 1962.9580 317.69 317.69 318.61 -1

1963 1 1963.0420 318.74 318.74 318.91 -1

1963 2 1963.1250 319.08 319.08 318.68 -1

1963 3 1963.2080 319.86 319.86 318.69 -11963 4 1963.2920 321.39 321.39 319.09 -1

1963 5 1963.3750 322.25 322.25 319.39 -1

1963 6 1963.4580 321.47 321.47 319.16 -1

1963 7 1963.5420 319.74 319.74 318.77 -1

1963 8 1963.6250 317.77 317.77 318.83 -1

1963 9 1963.7080 316.21 316.21 319.06 -1

1963 10 1963.7920 315.99 315.99 319.00 -1

1963 11 1963.8750 317.12 317.12 319.10 -1

1963 12 1963.9580 318.31 318.31 319.25 -1

1964 1 1964.0420 319.57 319.57 319.67 -1

1964 2 1964.1250 -99.99 320.07 319.61 -11964 3 1964.2080 -99.99 320.73 319.55 -1

1964 4 1964.2920 -99.99 321.77 319.48 -1

1964 5 1964.3750 322.25 322.25 319.42 -1

1964 6 1964.4580 321.89 321.89 319.69 -1

1964 7 1964.5420 320.44 320.44 319.58 -1

1964 8 1964.6250 318.70 318.70 319.81 -1

1964 9 1964.7080 316.70 316.70 319.56 -1

1964 10 1964.7920 316.79 316.79 319.78 -1


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1964 11 1964.8750 317.79 317.79 319.72 -1

1964 12 1964.9580 318.71 318.71 319.59 -1

1965 1 1965.0420 319.44 319.44 319.48 -1

1965 2 1965.1250 320.44 320.44 319.97 -1

1965 3 1965.2080 320.89 320.89 319.65 -1

1965 4 1965.2920 322.13 322.13 319.80 -1

1965 5 1965.3750 322.16 322.16 319.36 -11965 6 1965.4580 321.87 321.87 319.65 -1

1965 7 1965.5420 321.39 321.39 320.51 -1

1965 8 1965.6250 318.81 318.81 319.93 -1

1965 9 1965.7080 317.81 317.81 320.68 -1

1965 10 1965.7920 317.30 317.30 320.36 -1

1965 11 1965.8750 318.87 318.87 320.87 -1

1965 12 1965.9580 319.42 319.42 320.26 -1

1966 1 1966.0420 320.62 320.62 320.63 -1

1966 2 1966.1250 321.59 321.59 321.10 -1

1966 3 1966.2080 322.39 322.39 321.16 -1

1966 4 1966.2920 323.87 323.87 321.51 -1

1966 5 1966.3750 324.01 324.01 321.18 -1

1966 6 1966.4580 323.75 323.75 321.52 -1

1966 7 1966.5420 322.39 322.39 321.49 -1

1966 8 1966.6250 320.37 320.37 321.50 -1

1966 9 1966.7080 318.64 318.64 321.54 -1

1966 10 1966.7920 318.10 318.10 321.18 -1

1966 11 1966.8750 319.79 319.79 321.84 -1

1966 12 1966.9580 321.08 321.08 321.95 -1

1967 1 1967.0420 322.07 322.07 322.07 -1

1967 2 1967.1250 322.50 322.50 321.94 -11967 3 1967.2080 323.04 323.04 321.72 -1

1967 4 1967.2920 324.42 324.42 322.05 -1

1967 5 1967.3750 325.00 325.00 322.27 -1

1967 6 1967.4580 324.09 324.09 321.94 -1

1967 7 1967.5420 322.55 322.55 321.66 -1

1967 8 1967.6250 320.92 320.92 322.04 -1

1967 9 1967.7080 319.31 319.31 322.19 -1

1967 10 1967.7920 319.31 319.31 322.36 -1

1967 11 1967.8750 320.72 320.72 322.78 -1

1967 12 1967.9580 321.96 321.96 322.86 -1

1968 1 1968.0420 322.57 322.57 322.55 -11968 2 1968.1250 323.15 323.15 322.56 -1

1968 3 1968.2080 323.89 323.89 322.59 -1

1968 4 1968.2920 325.02 325.02 322.73 -1

1968 5 1968.3750 325.57 325.57 322.87 -1

1968 6 1968.4580 325.36 325.36 323.20 -1

1968 7 1968.5420 324.14 324.14 323.25 -1

1968 8 1968.6250 322.03 322.03 323.15 -1

1968 9 1968.7080 320.41 320.41 323.31 -1


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1968 10 1968.7920 320.25 320.25 323.32 -1

1968 11 1968.8750 321.31 321.31 323.32 -1

1968 12 1968.9580 322.84 322.84 323.69 -1

1969 1 1969.0420 324.00 324.00 323.98 -1

1969 2 1969.1250 324.42 324.42 323.89 -1

1969 3 1969.2080 325.64 325.64 324.41 -1

1969 4 1969.2920 326.66 326.66 324.35 -11969 5 1969.3750 327.34 327.34 324.57 -1

1969 6 1969.4580 326.76 326.76 324.63 -1

1969 7 1969.5420 325.88 325.88 325.08 -1

1969 8 1969.6250 323.67 323.67 324.80 -1

1969 9 1969.7080 322.38 322.38 325.28 -1

1969 10 1969.7920 321.78 321.78 324.84 -1

1969 11 1969.8750 322.85 322.85 324.78 -1

1969 12 1969.9580 324.11 324.11 324.88 -1

1970 1 1970.0420 325.03 325.03 325.04 -1

1970 2 1970.1250 325.99 325.99 325.42 -1

1970 3 1970.2080 326.87 326.87 325.69 -1

1970 4 1970.2920 328.13 328.13 325.86 -1

1970 5 1970.3750 328.07 328.07 325.27 -1

1970 6 1970.4580 327.66 327.66 325.52 -1

1970 7 1970.5420 326.35 326.35 325.51 -1

1970 8 1970.6250 324.69 324.69 325.76 -1

1970 9 1970.7080 323.10 323.10 325.93 -1

1970 10 1970.7920 323.16 323.16 326.15 -1

1970 11 1970.8750 323.98 323.98 325.96 -1

1970 12 1970.9580 325.13 325.13 326.06 -1

1971 1 1971.0420 326.17 326.17 326.26 -11971 2 1971.1250 326.68 326.68 326.09 -1

1971 3 1971.2080 327.18 327.18 325.94 -1

1971 4 1971.2920 327.78 327.78 325.47 -1

1971 5 1971.3750 328.92 328.92 326.11 -1

1971 6 1971.4580 328.57 328.57 326.41 -1

1971 7 1971.5420 327.34 327.34 326.46 -1

1971 8 1971.6250 325.46 325.46 326.49 -1

1971 9 1971.7080 323.36 323.36 326.18 -1

1971 10 1971.7920 323.57 323.57 326.58 -1

1971 11 1971.8750 324.80 324.80 326.82 -1

1971 12 1971.9580 326.01 326.01 327.02 -11972 1 1972.0420 326.77 326.77 326.86 -1

1972 2 1972.1250 327.63 327.63 327.05 -1

1972 3 1972.2080 327.75 327.75 326.52 -1

1972 4 1972.2920 329.72 329.72 327.41 -1

1972 5 1972.3750 330.07 330.07 327.21 -1

1972 6 1972.4580 329.09 329.09 326.94 -1

1972 7 1972.5420 328.05 328.05 327.24 -1

1972 8 1972.6250 326.32 326.32 327.37 -1


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1972 9 1972.7080 324.93 324.93 327.73 -1

1972 10 1972.7920 325.06 325.06 328.05 -1

1972 11 1972.8750 326.50 326.50 328.51 -1

1972 12 1972.9580 327.55 327.55 328.56 -1

1973 1 1973.0420 328.54 328.54 328.58 -1

1973 2 1973.1250 329.56 329.56 328.87 -1

1973 3 1973.2080 330.30 330.30 328.99 -11973 4 1973.2920 331.50 331.50 329.12 -1

1973 5 1973.3750 332.48 332.48 329.60 -1

1973 6 1973.4580 332.07 332.07 329.96 -1

1973 7 1973.5420 330.87 330.87 330.09 -1

1973 8 1973.6250 329.31 329.31 330.43 -1

1973 9 1973.7080 327.51 327.51 330.43 -1

1973 10 1973.7920 327.18 327.18 330.23 -1

1973 11 1973.8750 328.16 328.16 330.17 -1

1973 12 1973.9580 328.64 328.64 329.66 -1

1974 1 1974.0420 329.35 329.35 329.44 -1

1974 2 1974.1250 330.71 330.71 330.11 -1

1974 3 1974.2080 331.48 331.48 330.19 -1

1974 4 1974.2920 332.65 332.65 330.25 -1

1974 5 1974.3750 333.19 333.19 330.25 15

1974 6 1974.4580 332.12 332.12 329.93 27

1974 7 1974.5420 330.99 330.99 330.20 31

1974 8 1974.6250 329.17 329.17 330.31 31

1974 9 1974.7080 327.41 327.41 330.35 29

1974 10 1974.7920 327.21 327.21 330.29 29

1974 11 1974.8750 328.34 328.34 330.33 29

1974 12 1974.9580 329.50 329.50 330.47 311975 1 1975.0420 330.68 330.68 330.81 31

1975 2 1975.1250 331.41 331.41 330.86 28

1975 3 1975.2080 331.85 331.85 330.49 26

1975 4 1975.2920 333.29 333.29 330.77 30

1975 5 1975.3750 333.91 333.91 330.94 30

1975 6 1975.4580 333.40 333.40 331.18 29

1975 7 1975.5420 331.74 331.74 330.92 27

1975 8 1975.6250 329.88 329.88 331.06 31

1975 9 1975.7080 328.57 328.57 331.54 30

1975 10 1975.7920 328.36 328.36 331.46 17

1975 11 1975.8750 329.33 329.33 331.39 251975 12 1975.9580 -99.99 330.59 331.60 1

1976 1 1976.0420 331.66 331.66 331.82 25

1976 2 1976.1250 332.75 332.75 332.19 29

1976 3 1976.2080 333.46 333.46 331.99 29

1976 4 1976.2920 334.78 334.78 332.24 25

1976 5 1976.3750 334.78 334.78 331.86 31

1976 6 1976.4580 334.06 334.06 331.74 25

1976 7 1976.5420 332.95 332.95 332.06 21


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1976 8 1976.6250 330.64 330.64 331.87 31

1976 9 1976.7080 328.96 328.96 331.94 28

1976 10 1976.7920 328.77 328.77 331.92 30

1976 11 1976.8750 330.18 330.18 332.33 26

1976 12 1976.9580 331.65 331.65 332.69 24

1977 1 1977.0420 332.69 332.69 332.75 29

1977 2 1977.1250 333.23 333.23 332.60 261977 3 1977.2080 334.97 334.97 333.36 29

1977 4 1977.2920 336.03 336.03 333.39 29

1977 5 1977.3750 336.82 336.82 333.87 30

1977 6 1977.4580 336.10 336.10 333.76 25

1977 7 1977.5420 334.79 334.79 333.96 28

1977 8 1977.6250 332.53 332.53 333.92 30

1977 9 1977.7080 331.19 331.19 334.27 27

1977 10 1977.7920 331.21 331.21 334.43 30

1977 11 1977.8750 332.35 332.35 334.59 28

1977 12 1977.9580 333.47 333.47 334.48 31

1978 1 1978.0420 335.10 335.10 335.11 26

1978 2 1978.1250 335.26 335.26 334.58 28

1978 3 1978.2080 336.61 336.61 334.95 30

1978 4 1978.2920 337.77 337.77 335.11 28

1978 5 1978.3750 338.01 338.01 335.05 30

1978 6 1978.4580 337.98 337.98 335.60 27

1978 7 1978.5420 336.48 336.48 335.68 31

1978 8 1978.6250 334.37 334.37 335.88 31

1978 9 1978.7080 332.33 332.33 335.49 24

1978 10 1978.7920 332.41 332.41 335.66 31

1978 11 1978.8750 333.76 333.76 336.01 281978 12 1978.9580 334.83 334.83 335.79 31

1979 1 1979.0420 336.21 336.21 336.23 31

1979 2 1979.1250 336.65 336.65 335.94 27

1979 3 1979.2080 338.13 338.13 336.40 29

1979 4 1979.2920 338.94 338.94 336.21 24

1979 5 1979.3750 339.00 339.00 336.01 20

1979 6 1979.4580 339.20 339.20 336.79 30

1979 7 1979.5420 337.60 337.60 336.78 29

1979 8 1979.6250 335.56 335.56 337.10 29

1979 9 1979.7080 333.93 333.93 337.17 26

1979 10 1979.7920 334.12 334.12 337.44 281979 11 1979.8750 335.26 335.26 337.54 30

1979 12 1979.9580 336.78 336.78 337.76 24

1980 1 1980.0420 337.80 337.80 337.95 30

1980 2 1980.1250 338.28 338.28 337.73 28

1980 3 1980.2080 340.04 340.04 338.43 31

1980 4 1980.2920 340.86 340.86 338.20 30

1980 5 1980.3750 341.47 341.47 338.45 31

1980 6 1980.4580 341.26 341.26 338.79 30


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1980 7 1980.5420 339.34 339.34 338.48 26

1980 8 1980.6250 337.45 337.45 338.92 24

1980 9 1980.7080 336.10 336.10 339.27 26

1980 10 1980.7920 336.05 336.05 339.32 29

1980 11 1980.8750 337.21 337.21 339.38 27

1980 12 1980.9580 338.29 338.29 339.23 27

1981 1 1981.0420 339.36 339.36 339.41 311981 2 1981.1250 340.51 340.51 339.89 28

1981 3 1981.2080 341.57 341.57 339.98 31

1981 4 1981.2920 342.56 342.56 339.93 30

1981 5 1981.3750 343.01 343.01 339.98 31

1981 6 1981.4580 342.49 342.49 340.02 28

1981 7 1981.5420 340.68 340.68 339.81 31

1981 8 1981.6250 338.49 338.49 339.97 28

1981 9 1981.7080 336.92 336.92 340.17 30

1981 10 1981.7920 337.12 337.12 340.44 31

1981 11 1981.8750 338.59 338.59 340.76 30

1981 12 1981.9580 339.90 339.90 340.81 28

1982 1 1982.0420 340.92 340.92 341.03 30

1982 2 1982.1250 341.69 341.69 341.05 27

1982 3 1982.2080 342.85 342.85 341.21 21

1982 4 1982.2920 343.92 343.92 341.30 9

1982 5 1982.3750 344.67 344.67 341.63 31

1982 6 1982.4580 343.78 343.78 341.33 29

1982 7 1982.5420 342.23 342.23 341.45 28

1982 8 1982.6250 340.11 340.11 341.61 27

1982 9 1982.7080 338.32 338.32 341.53 26

1982 10 1982.7920 338.39 338.39 341.72 301982 11 1982.8750 339.48 339.48 341.62 28

1982 12 1982.9580 340.88 340.88 341.77 31

1983 1 1983.0420 341.64 341.64 341.79 31

1983 2 1983.1250 342.87 342.87 342.30 27

1983 3 1983.2080 343.59 343.59 342.04 30

1983 4 1983.2920 345.25 345.25 342.63 26

1983 5 1983.3750 345.96 345.96 342.80 29

1983 6 1983.4580 345.52 345.52 343.03 25

1983 7 1983.5420 344.15 344.15 343.41 30

1983 8 1983.6250 342.25 342.25 343.72 28

1983 9 1983.7080 340.17 340.17 343.34 271983 10 1983.7920 340.30 340.30 343.63 31

1983 11 1983.8750 341.53 341.53 343.66 29

1983 12 1983.9580 343.07 343.07 343.97 26

1984 1 1984.0420 344.05 344.05 344.15 31

1984 2 1984.1250 344.77 344.77 344.21 29

1984 3 1984.2080 345.46 345.46 344.00 23

1984 4 1984.2920 -99.99 346.77 344.17 2

1984 5 1984.3750 347.55 347.55 344.35 27


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1984 6 1984.4580 346.98 346.98 344.49 25

1984 7 1984.5420 345.55 345.55 344.82 29

1984 8 1984.6250 343.20 343.20 344.67 24

1984 9 1984.7080 341.35 341.35 344.54 27

1984 10 1984.7920 341.68 341.68 344.99 28

1984 11 1984.8750 343.06 343.06 345.16 28

1984 12 1984.9580 344.54 344.54 345.42 281985 1 1985.0420 345.25 345.25 345.35 29

1985 2 1985.1250 346.06 346.06 345.51 26

1985 3 1985.2080 347.66 347.66 346.27 28

1985 4 1985.2920 348.20 348.20 345.64 27

1985 5 1985.3750 348.92 348.92 345.75 31

1985 6 1985.4580 348.40 348.40 345.94 30

1985 7 1985.5420 346.66 346.66 345.86 28

1985 8 1985.6250 344.85 344.85 346.22 27

1985 9 1985.7080 343.20 343.20 346.32 27

1985 10 1985.7920 343.08 343.08 346.36 27

1985 11 1985.8750 344.40 344.40 346.53 29

1985 12 1985.9580 345.82 345.82 346.75 29

1986 1 1986.0420 346.54 346.54 346.56 26

1986 2 1986.1250 347.13 347.13 346.59 26

1986 3 1986.2080 348.05 348.05 346.71 31

1986 4 1986.2920 349.77 349.77 347.21 30

1986 5 1986.3750 350.53 350.53 347.39 30

1986 6 1986.4580 349.90 349.90 347.47 24

1986 7 1986.5420 348.11 348.11 347.30 26

1986 8 1986.6250 346.09 346.09 347.49 29

1986 9 1986.7080 345.01 345.01 348.16 251986 10 1986.7920 344.47 344.47 347.71 30

1986 11 1986.8750 345.86 345.86 347.99 30

1986 12 1986.9580 347.15 347.15 348.06 30

1987 1 1987.0420 348.38 348.38 348.31 30

1987 2 1987.1250 348.70 348.70 348.01 28

1987 3 1987.2080 349.72 349.72 348.31 27

1987 4 1987.2920 351.32 351.32 348.77 30

1987 5 1987.3750 352.14 352.14 349.03 31

1987 6 1987.4580 351.61 351.61 349.23 29

1987 7 1987.5420 349.91 349.91 349.20 28

1987 8 1987.6250 347.84 347.84 349.34 271987 9 1987.7080 346.52 346.52 349.71 29

1987 10 1987.7920 346.65 346.65 349.88 30

1987 11 1987.8750 347.95 347.95 350.07 27

1987 12 1987.9580 349.18 349.18 350.07 30

1988 1 1988.0420 350.38 350.38 350.36 29

1988 2 1988.1250 351.68 351.68 351.01 27

1988 3 1988.2080 352.24 352.24 350.76 30

1988 4 1988.2920 353.66 353.66 351.00 30


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1988 5 1988.3750 354.18 354.18 350.99 31

1988 6 1988.4580 353.68 353.68 351.30 29

1988 7 1988.5420 352.58 352.58 351.94 30

1988 8 1988.6250 350.66 350.66 352.19 27

1988 9 1988.7080 349.03 349.03 352.22 29

1988 10 1988.7920 349.08 349.08 352.34 31

1988 11 1988.8750 350.15 350.15 352.29 271988 12 1988.9580 351.44 351.44 352.36 30

1989 1 1989.0420 352.89 352.89 352.83 31

1989 2 1989.1250 353.24 353.24 352.55 28

1989 3 1989.2080 353.80 353.80 352.36 30

1989 4 1989.2920 355.59 355.59 352.93 30

1989 5 1989.3750 355.89 355.89 352.65 31

1989 6 1989.4580 355.30 355.30 352.88 30

1989 7 1989.5420 353.98 353.98 353.33 31

1989 8 1989.6250 351.53 351.53 353.11 29

1989 9 1989.7080 350.02 350.02 353.27 28

1989 10 1989.7920 350.29 350.29 353.53 30

1989 11 1989.8750 351.44 351.44 353.60 30

1989 12 1989.9580 352.84 352.84 353.78 28

1990 1 1990.0420 353.79 353.79 353.74 30

1990 2 1990.1250 354.88 354.88 354.20 28

1990 3 1990.2080 355.65 355.65 354.21 31

1990 4 1990.2920 356.27 356.27 353.66 29

1990 5 1990.3750 357.29 357.29 354.10 30

1990 6 1990.4580 356.32 356.32 353.92 30

1990 7 1990.5420 354.89 354.89 354.27 29

1990 8 1990.6250 352.89 352.89 354.51 301990 9 1990.7080 351.28 351.28 354.53 27

1990 10 1990.7920 351.59 351.59 354.81 31

1990 11 1990.8750 353.05 353.05 355.10 29

1990 12 1990.9580 354.27 354.27 355.12 30

1991 1 1991.0420 354.87 354.87 354.85 29

1991 2 1991.1250 355.68 355.68 355.01 28

1991 3 1991.2080 357.06 357.06 355.57 27

1991 4 1991.2920 358.51 358.51 355.88 30

1991 5 1991.3750 359.09 359.09 355.94 31

1991 6 1991.4580 358.10 358.10 355.75 30

1991 7 1991.5420 356.12 356.12 355.51 291991 8 1991.6250 353.89 353.89 355.50 31

1991 9 1991.7080 352.30 352.30 355.58 30

1991 10 1991.7920 352.32 352.32 355.55 31

1991 11 1991.8750 353.79 353.79 355.78 30

1991 12 1991.9580 355.07 355.07 355.89 31

1992 1 1992.0420 356.17 356.17 356.12 30

1992 2 1992.1250 356.93 356.93 356.23 29

1992 3 1992.2080 357.82 357.82 356.28 29


12/22

1992 4 1992.2920 359.00 359.00 356.30 30

1992 5 1992.3750 359.55 359.55 356.33 31

1992 6 1992.4580 359.32 359.32 356.92 30

1992 7 1992.5420 356.85 356.85 356.27 30

1992 8 1992.6250 354.91 354.91 356.61 30

1992 9 1992.7080 352.93 352.93 356.27 29

1992 10 1992.7920 353.31 353.31 356.57 301992 11 1992.8750 354.27 354.27 356.32 30

1992 12 1992.9580 355.53 355.53 356.37 31

1993 1 1993.0420 356.86 356.86 356.83 28

1993 2 1993.1250 357.27 357.27 356.43 28

1993 3 1993.2080 358.36 358.36 356.70 31

1993 4 1993.2920 359.27 359.27 356.60 30

1993 5 1993.3750 360.19 360.19 357.00 31

1993 6 1993.4580 359.52 359.52 357.09 30

1993 7 1993.5420 357.42 357.42 356.83 27

1993 8 1993.6250 355.46 355.46 357.14 28

1993 9 1993.7080 354.10 354.10 357.45 26

1993 10 1993.7920 354.12 354.12 357.46 30

1993 11 1993.8750 355.40 355.40 357.53 30

1993 12 1993.9580 356.84 356.84 357.76 31

1994 1 1994.0420 358.22 358.22 358.13 27

1994 2 1994.1250 358.98 358.98 358.15 27

1994 3 1994.2080 359.91 359.91 358.25 30

1994 4 1994.2920 361.32 361.32 358.57 30

1994 5 1994.3750 361.68 361.68 358.44 30

1994 6 1994.4580 360.80 360.80 358.39 30

1994 7 1994.5420 359.39 359.39 358.79 311994 8 1994.6250 357.42 357.42 359.12 31

1994 9 1994.7080 355.63 355.63 359.05 30

1994 10 1994.7920 356.09 356.09 359.50 31

1994 11 1994.8750 357.56 357.56 359.72 30

1994 12 1994.9580 358.87 358.87 359.75 31

1995 1 1995.0420 359.87 359.87 359.76 31

1995 2 1995.1250 360.79 360.79 359.98 28

1995 3 1995.2080 361.77 361.77 360.19 30

1995 4 1995.2920 363.23 363.23 360.56 30

1995 5 1995.3750 363.77 363.77 360.61 29

1995 6 1995.4580 363.22 363.22 360.82 301995 7 1995.5420 361.70 361.70 361.03 31

1995 8 1995.6250 359.11 359.11 360.74 30

1995 9 1995.7080 358.11 358.11 361.48 30

1995 10 1995.7920 357.97 357.97 361.34 31

1995 11 1995.8750 359.40 359.40 361.54 30

1995 12 1995.9580 360.61 360.61 361.49 30

1996 1 1996.0420 362.04 362.04 361.84 31

1996 2 1996.1250 363.17 363.17 362.29 29


13/22

1996 3 1996.2080 364.17 364.17 362.55 31

1996 4 1996.2920 364.51 364.51 361.81 29

1996 5 1996.3750 365.16 365.16 362.10 31

1996 6 1996.4580 364.93 364.93 362.64 30

1996 7 1996.5420 363.53 363.53 362.83 31

1996 8 1996.6250 361.38 361.38 362.99 30

1996 9 1996.7080 359.60 359.60 363.03 281996 10 1996.7920 359.54 359.54 362.91 31

1996 11 1996.8750 360.84 360.84 362.99 30

1996 12 1996.9580 362.18 362.18 363.05 31

1997 1 1997.0420 363.04 363.04 362.85 31

1997 2 1997.1250 364.09 364.09 363.28 28

1997 3 1997.2080 364.47 364.47 362.86 31

1997 4 1997.2920 366.25 366.25 363.59 29

1997 5 1997.3750 366.69 366.69 363.76 30

1997 6 1997.4580 365.59 365.59 363.39 28

1997 7 1997.5420 364.34 364.34 363.63 26

1997 8 1997.6250 362.20 362.20 363.78 27

1997 9 1997.7080 360.31 360.31 363.69 29

1997 10 1997.7920 360.71 360.71 364.01 31

1997 11 1997.8750 362.44 362.44 364.51 29

1997 12 1997.9580 364.33 364.33 365.12 31

1998 1 1998.0420 365.18 365.18 365.01 30

1998 2 1998.1250 365.98 365.98 365.18 27

1998 3 1998.2080 367.13 367.13 365.50 31

1998 4 1998.2920 368.61 368.61 366.00 30

1998 5 1998.3750 369.49 369.49 366.60 30

1998 6 1998.4580 368.95 368.95 366.73 301998 7 1998.5420 367.74 367.74 367.05 30

1998 8 1998.6250 365.79 365.79 367.37 31

1998 9 1998.7080 364.01 364.01 367.34 29

1998 10 1998.7920 364.35 364.35 367.63 31

1998 11 1998.8750 365.52 365.52 367.58 23

1998 12 1998.9580 367.08 367.08 367.85 26

1999 1 1999.0420 368.12 368.12 367.92 27

1999 2 1999.1250 368.98 368.98 368.18 23

1999 3 1999.2080 369.60 369.60 368.00 25

1999 4 1999.2920 370.96 370.96 368.44 30

1999 5 1999.3750 370.77 370.77 367.95 301999 6 1999.4580 370.33 370.33 368.14 30

1999 7 1999.5420 369.28 369.28 368.60 30

1999 8 1999.6250 366.86 366.86 368.42 30

1999 9 1999.7080 364.94 364.94 368.24 28

1999 10 1999.7920 365.35 365.35 368.62 31

1999 11 1999.8750 366.68 366.68 368.68 29

1999 12 1999.9580 368.04 368.04 368.72 29

2000 1 2000.0420 369.25 369.25 369.06 27


14/22

2000 2 2000.1250 369.50 369.50 368.79 23

2000 3 2000.2080 370.56 370.56 369.04 31

2000 4 2000.2920 371.82 371.82 369.29 29

2000 5 2000.3750 371.51 371.51 368.64 29

2000 6 2000.4580 371.71 371.71 369.49 29

2000 7 2000.5420 369.85 369.85 369.18 28

2000 8 2000.6250 368.20 368.20 369.78 282000 9 2000.7080 366.91 366.91 370.19 30

2000 10 2000.7920 366.99 366.99 370.22 31

2000 11 2000.8750 368.33 368.33 370.29 25

2000 12 2000.9580 369.67 369.67 370.31 30

2001 1 2001.0420 370.52 370.52 370.36 29

2001 2 2001.1250 371.49 371.49 370.77 28

2001 3 2001.2080 372.53 372.53 370.97 29

2001 4 2001.2920 373.37 373.37 370.79 30

2001 5 2001.3750 373.82 373.82 370.92 25

2001 6 2001.4580 373.18 373.18 370.97 28

2001 7 2001.5420 371.57 371.57 370.94 30

2001 8 2001.6250 369.63 369.63 371.21 30

2001 9 2001.7080 368.16 368.16 371.41 30

2001 10 2001.7920 368.42 368.42 371.65 31

2001 11 2001.8750 369.69 369.69 371.70 27

2001 12 2001.9580 371.18 371.18 371.89 31

2002 1 2002.0420 372.45 372.45 372.23 29

2002 2 2002.1250 373.14 373.14 372.26 27

2002 3 2002.2080 373.93 373.93 372.22 27

2002 4 2002.2920 375.00 375.00 372.33 30

2002 5 2002.3750 375.65 375.65 372.74 312002 6 2002.4580 375.50 375.50 373.29 30

2002 7 2002.5420 374.00 374.00 373.36 31

2002 8 2002.6250 371.83 371.83 373.47 31

2002 9 2002.7080 370.66 370.66 374.01 29

2002 10 2002.7920 370.51 370.51 373.85 31

2002 11 2002.8750 372.20 372.20 374.33 30

2002 12 2002.9580 373.71 373.71 374.50 30

2003 1 2003.0420 374.87 374.87 374.63 31

2003 2 2003.1250 375.62 375.62 374.75 27

2003 3 2003.2080 376.48 376.48 374.79 31

2003 4 2003.2920 377.74 377.74 375.02 272003 5 2003.3750 378.50 378.50 375.47 31

2003 6 2003.4580 378.18 378.18 375.95 29

2003 7 2003.5420 376.72 376.72 376.16 28

2003 8 2003.6250 374.31 374.31 375.98 26

2003 9 2003.7080 373.20 373.20 376.51 28

2003 10 2003.7920 373.10 373.10 376.45 30

2003 11 2003.8750 374.64 374.64 376.83 25

2003 12 2003.9580 375.93 375.93 376.74 30


15/22

2004 1 2004.0420 377.00 377.00 376.79 31

2004 2 2004.1250 377.87 377.87 377.01 27

2004 3 2004.2080 378.73 378.73 377.06 30

2004 4 2004.2920 380.41 380.41 377.65 29

2004 5 2004.3750 380.63 380.63 377.51 28

2004 6 2004.4580 379.56 379.56 377.28 26

2004 7 2004.5420 377.61 377.61 377.03 282004 8 2004.6250 376.15 376.15 377.85 19

2004 9 2004.7080 374.11 374.11 377.49 16

2004 10 2004.7920 374.44 374.44 377.80 31

2004 11 2004.8750 375.93 375.93 378.13 27

2004 12 2004.9580 377.45 377.45 378.30 31

2005 1 2005.0420 378.47 378.47 378.21 31

2005 2 2005.1250 379.76 379.76 378.95 27

2005 3 2005.2080 381.14 381.14 379.63 27

2005 4 2005.2920 382.20 382.20 379.54 30

2005 5 2005.3750 382.47 382.47 379.33 31

2005 6 2005.4580 382.20 382.20 379.87 30

2005 7 2005.5420 380.78 380.78 380.17 30

2005 8 2005.6250 378.73 378.73 380.38 30

2005 9 2005.7080 376.66 376.66 379.98 30

2005 10 2005.7920 376.98 376.98 380.29 14

2005 11 2005.8750 378.29 378.29 380.47 24

2005 12 2005.9580 379.92 379.92 380.75 29

2006 1 2006.0420 381.35 381.35 381.11 26

2006 2 2006.1250 382.16 382.16 381.35 25

2006 3 2006.2080 382.66 382.66 381.11 30

2006 4 2006.2920 384.73 384.73 382.01 272006 5 2006.3750 384.98 384.98 381.83 29

2006 6 2006.4580 384.09 384.09 381.78 29

2006 7 2006.5420 382.38 382.38 381.81 27

2006 8 2006.6250 380.45 380.45 382.10 28

2006 9 2006.7080 378.92 378.92 382.22 29

2006 10 2006.7920 379.16 379.16 382.48 25

2006 11 2006.8750 380.18 380.18 382.38 30

2006 12 2006.9580 381.79 381.79 382.65 31

2007 1 2007.0420 382.93 382.93 382.75 23

2007 2 2007.1250 383.81 383.81 382.96 21

2007 3 2007.2080 384.56 384.56 382.92 312007 4 2007.2920 386.40 386.40 383.58 28

2007 5 2007.3750 386.58 386.58 383.35 31

2007 6 2007.4580 386.05 386.05 383.77 30

2007 7 2007.5420 384.49 384.49 383.98 31

2007 8 2007.6250 382.00 382.00 383.70 30

2007 9 2007.7080 380.90 380.90 384.25 25

2007 10 2007.7920 381.14 381.14 384.47 30

2007 11 2007.8750 382.42 382.42 384.64 30


16/22

2007 12 2007.9580 383.89 383.89 384.81 28

2008 1 2008.0420 385.44 385.44 385.26 31

2008 2 2008.1250 385.73 385.73 384.92 28

2008 3 2008.2080 385.97 385.97 384.41 30

2008 4 2008.2920 387.16 387.16 384.50 28

2008 5 2008.3750 388.50 388.50 385.39 26

2008 6 2008.4580 387.88 387.88 385.56 242008 7 2008.5420 386.42 386.42 385.86 10

2008 8 2008.6250 384.15 384.15 385.83 28

2008 9 2008.7080 383.09 383.09 386.34 30

2008 10 2008.7920 382.99 382.99 386.24 24

2008 11 2008.8750 384.13 384.13 386.31 29

2008 12 2008.9580 385.56 385.56 386.43 30

2009 1 2009.0420 386.93 386.93 386.71 31

2009 2 2009.1250 387.42 387.42 386.59 28

2009 3 2009.2080 388.77 388.77 387.21 30

2009 4 2009.2920 389.46 389.46 386.73 28

2009 5 2009.3750 390.19 390.19 387.02 31

2009 6 2009.4580 389.44 389.44 387.11 29

2009 7 2009.5420 387.91 387.91 387.32 29

2009 8 2009.6250 385.92 385.92 387.59 30

2009 9 2009.7080 384.79 384.79 388.12 27

2009 10 2009.7920 384.39 384.39 387.71 31

2009 11 2009.8750 386.00 386.00 388.23 30

2009 12 2009.9580 387.27 387.27 388.17 21

2010 1 2010.0420 388.45 388.45 388.23 28

2010 2 2010.1250 389.82 389.82 388.98 24

2010 3 2010.2080 391.08 391.08 389.52 282010 4 2010.2920 392.46 392.46 389.73 28

2010 5 2010.3750 392.95 392.95 389.78 30

2010 6 2010.4580 392.03 392.03 389.71 29

2010 7 2010.5420 390.13 390.13 389.53 30

2010 8 2010.6250 388.15 388.15 389.82 31

2010 9 2010.7080 386.80 386.80 390.14 30

2010 10 2010.7920 387.18 387.18 390.50 31

2010 11 2010.8750 388.59 388.59 390.81 29

2010 12 2010.9580 389.68 389.68 390.57 31

2011 1 2011.0420 391.19 391.19 390.96 29

2011 2 2011.125 391.76 391.76 390.93 282011 3 2011.208 392.40 392.40 390.84 30

2011 4 2011.292 393.28 393.28 390.56 28

2011 5 2011.375 394.16 394.16 390.98 31

2011 6 2011.458 393.68 393.68 391.35 28

2011 7 2011.542 392.39 392.39 391.79 31

2011 8 2011.625 390.08 390.08 391.75 29

2011 9 2011.708 389.00 389.00 392.34 28

2011 10 2011.792 388.92 388.92 392.25 31


17/22

2011 11 2011.875 390.20 390.20 392.42 29

2011 12 2011.958 391.80 391.80 392.69 31

2012 1 2012.042 393.09 393.09 392.86 30

2012 2 2012.125 393.55 393.55 392.72 27

2012 3 2012.208 394.44 394.44 392.88 31

2012 4 2012.292 396.18 396.18 393.46 30

2012 5 2012.375 396.78 396.78 393.6 312012 6 2012.458 395.85 395.85 393.52 28

2012 7 2012.542 394.29 394.29 393.69 29

2012 8 2012.625 392.41 392.41 394.08 31


18/22

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

1958 315.71 317.45 317.50 317.10 315.86 314.93 313.20 312.66 313.33 314.67

1959 315.62 316.38 316.71 317.72 318.29 318.15 316.54 314.80 313.84 313.26 314.80 315.58

1960 316.43 316.97 317.58 319.02 320.03 319.59 318.18 315.91 314.16 313.83 315.00 316.19

1961 316.93 317.70 318.54 319.48 320.58 319.77 318.57 316.79 314.80 315.38 316.10 317.01

1962 317.94 318.56 319.68 320.63 321.01 320.55 319.58 317.40 316.26 315.42 316.69 317.69

1963 318.74 319.08 319.86 321.39 322.25 321.47 319.74 317.77 316.21 315.99 317.12 318.31

1964 319.57 320.07 320.73 321.77 322.25 321.89 320.44 318.70 316.70 316.79 317.79 318.71

1965 319.44 320.44 320.89 322.13 322.16 321.87 321.39 318.81 317.81 317.30 318.87 319.42

1966 320.62 321.59 322.39 323.87 324.01 323.75 322.39 320.37 318.64 318.10 319.79 321.08

1967 322.07 322.50 323.04 324.42 325.00 324.09 322.55 320.92 319.31 319.31 320.72 321.96

1968 322.57 323.15 323.89 325.02 325.57 325.36 324.14 322.03 320.41 320.25 321.31 322.84

1969 324.00 324.42 325.64 326.66 327.34 326.76 325.88 323.67 322.38 321.78 322.85 324.11

1970 325.03 325.99 326.87 328.13 328.07 327.66 326.35 324.69 323.10 323.16 323.98 325.13

1971 326.17 326.68 327.18 327.78 328.92 328.57 327.34 325.46 323.36 323.57 324.80 326.01

1972 326.77 327.63 327.75 329.72 330.07 329.09 328.05 326.32 324.93 325.06 326.50 327.55

1973 328.54 329.56 330.30 331.50 332.48 332.07 330.87 329.31 327.51 327.18 328.16 328.64

1974 329.35 330.71 331.48 332.65 333.19 332.12 330.99 329.17 327.41 327.21 328.34 329.501975 330.68 331.41 331.85 333.29 333.91 333.40 331.74 329.88 328.57 328.36 329.33 330.59

1976 331.66 332.75 333.46 334.78 334.78 334.06 332.95 330.64 328.96 328.77 330.18 331.65

1977 332.69 333.23 334.97 336.03 336.82 336.10 334.79 332.53 331.19 331.21 332.35 333.47

1978 335.10 335.26 336.61 337.77 338.01 337.98 336.48 334.37 332.33 332.41 333.76 334.83

1979 336.21 336.65 338.13 338.94 339.00 339.20 337.60 335.56 333.93 334.12 335.26 336.78

1980 337.80 338.28 340.04 340.86 341.47 341.26 339.34 337.45 336.10 336.05 337.21 338.29

1981 339.36 340.51 341.57 342.56 343.01 342.49 340.68 338.49 336.92 337.12 338.59 339.90

1982 340.92 341.69 342.85 343.92 344.67 343.78 342.23 340.11 338.32 338.39 339.48 340.88

1983 341.64 342.87 343.59 345.25 345.96 345.52 344.15 342.25 340.17 340.30 341.53 343.07

1984 344.05 344.77 345.46 346.77 347.55 346.98 345.55 343.20 341.35 341.68 343.06 344.54

1985 345.25 346.06 347.66 348.20 348.92 348.40 346.66 344.85 343.20 343.08 344.40 345.82

1986 346.54 347.13 348.05 349.77 350.53 349.90 348.11 346.09 345.01 344.47 345.86 347.15

1987 348.38 348.70 349.72 351.32 352.14 351.61 349.91 347.84 346.52 346.65 347.95 349.18

1988 350.38 351.68 352.24 353.66 354.18 353.68 352.58 350.66 349.03 349.08 350.15 351.44

1989 352.89 353.24 353.80 355.59 355.89 355.30 353.98 351.53 350.02 350.29 351.44 352.84

1990 353.79 354.88 355.65 356.27 357.29 356.32 354.89 352.89 351.28 351.59 353.05 354.27

1991 354.87 355.68 357.06 358.51 359.09 358.10 356.12 353.89 352.30 352.32 353.79 355.07

1992 356.17 356.93 357.82 359.00 359.55 359.32 356.85 354.91 352.93 353.31 354.27 355.53

Monthly Mean Concentrations at the Mauna Loa Observatory (PPM)


This CO2Now worksheet was produced using the "Interpolated CO2" column in the "NOAA-ESRL Dataset" worksheet.

Latest update by NOAA-ESRL: September 5, 2012

Scripps data from March 1958 - April 1974 | NOAA-ESRL data since May 1974

Page 18 of 22


19/22

1993 356.86 357.27 358.36 359.27 360.19 359.52 357.42 355.46 354.10 354.12 355.40 356.84

1994 358.22 358.98 359.91 361.32 361.68 360.80 359.39 357.42 355.63 356.09 357.56 358.87

1995 359.87 360.79 361.77 363.23 363.77 363.22 361.70 359.11 358.11 357.97 359.40 360.61

1996 362.04 363.17 364.17 364.51 365.16 364.93 363.53 361.38 359.60 359.54 360.84 362.18

1997 363.04 364.09 364.47 366.25 366.69 365.59 364.34 362.20 360.31 360.71 362.44 364.33

1998 365.18 365.98 367.13 368.61 369.49 368.95 367.74 365.79 364.01 364.35 365.52 367.08

1999 368.12 368.98 369.60 370.96 370.77 370.33 369.28 366.86 364.94 365.35 366.68 368.042000 369.25 369.50 370.56 371.82 371.51 371.71 369.85 368.20 366.91 366.99 368.33 369.67

2001 370.52 371.49 372.53 373.37 373.82 373.18 371.57 369.63 368.16 368.42 369.69 371.18

2002 372.45 373.14 373.93 375.00 375.65 375.50 374.00 371.83 370.66 370.51 372.20 373.71

2003 374.87 375.62 376.48 377.74 378.50 378.18 376.72 374.31 373.20 373.10 374.64 375.93

2004 377.00 377.87 378.73 380.41 380.63 379.56 377.61 376.15 374.11 374.44 375.93 377.45

2005 378.47 379.76 381.14 382.20 382.47 382.20 380.78 378.73 376.66 376.98 378.29 379.92

2006 381.35 382.16 382.66 384.73 384.98 384.09 382.38 380.45 378.92 379.16 380.18 381.79

2007 382.93 383.81 384.56 386.40 386.58 386.05 384.49 382.00 380.90 381.14 382.42 383.89

2008 385.44 385.73 385.97 387.16 388.50 387.88 386.42 384.15 383.09 382.99 384.13 385.56

2009 386.93 387.42 388.77 389.46 390.19 389.44 387.91 385.92 384.79 384.39 386.00 387.27

2010 388.45 389.82 391.08 392.46 392.95 392.03 390.13 388.15 386.80 387.18 388.59 389.68

2011 391.19 391.76 392.40 393.28 394.16 393.68 392.39 390.08 389.00 388.92 390.20 391.80

2012 393.09 393.55 394.44 396.18 396.78 395.85 394.29 392.41 #REF! #REF! #REF! #REF!

Page 19 of 22


20/22

Year

CO2 Concentration Posted

by NOAA

Uncertainty Posted

by NOAA

CO2 Concentration

Calculated

1959 315.97 0.12 315.97

1960 316.91 0.12 316.91

1961 317.64 0.12 317.64

1962 318.45 0.12 318.45

1963 318.99 0.12 318.991964 319.62 0.12 319.62

1965 320.04 0.12 320.04

1966 321.38 0.12 321.38

1967 322.16 0.12 322.16

1968 323.04 0.12 323.05

1969 324.62 0.12 324.62

1970 325.68 0.12 325.68

1971 326.32 0.12 326.32

1972 327.45 0.12 327.45

1973 329.68 0.12 329.68

1974 330.18 0.12 330.18

1975 331.08 0.12 331.08

1976 332.05 0.12 332.05

1977 333.78 0.12 333.78

1978 335.41 0.12 335.41

1979 336.78 0.12 336.78

1980 338.68 0.12 338.68

1981 340.10 0.12 340.10

1982 341.44 0.12 341.44

1983 343.03 0.12 343.03

1984 344.58 0.12 344.581985 346.04 0.12 346.04

1986 347.39 0.12 347.38

1987 349.16 0.12 349.16

1988 351.56 0.12 351.56

1989 353.07 0.12 353.07

1990 354.35 0.12 354.35

1991 355.57 0.12 355.57

1992 356.38 0.12 356.38

NOAA-ESRL annual data is posted at ftp://ftp.cmdl.noaa.gov/ccg/co2/trends/co2_annmean_mlo.txt


Annual Mean Concentrations at the Mauna Loa Observatory (PPM)

1959 - 2011 (Data Released January 5, 2012)

Scripps annual data from January 1959 - April 1974 | NOAA-ESRL data since May 1974

Page 20 of 22


21/22

1993 357.07 0.12 357.07

1994 358.82 0.12 358.82

1995 360.80 0.12 360.80

1996 362.59 0.12 362.59

1997 363.71 0.12 363.71

1998 366.65 0.12 366.65

1999 368.33 0.12 368.332000 369.52 0.12 369.53

2001 371.13 0.12 371.13

2002 373.22 0.12 373.22

2003 375.77 0.12 375.77

2004 377.49 0.12 377.49

2005 379.80 0.12 379.80

2006 381.90 0.12 381.90

2007 383.77 0.12 383.76

2008 385.59 0.12 385.59

2009 387.38 0.12 387.37

2010 389.78 0.12 389.78

2011 391.57 0.12 391.57

Page 21 of 22


22/22

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

2003-2012 2.07 2.03 1.99 1.99 2.03 2.05 2.08 2.05 2.08 2.05 2.05 2.06

1993-2002 1.57 1.58 1.55 1.49 1.47 1.51 1.55 1.57 1.59 1.61 1.59 1.61

1983-1992 1.55 1.52 1.55 1.60 1.61 1.56 1.54 1.54 1.54 1.52 1.52 1.52

1973-1982 1.32 1.38 1.44 1.48 1.41 1.39 1.33 1.30 1.36 1.36 1.38 1.39

1963-1972 0.92 0.90 0.86 0.83 0.83 0.88 0.88 0.87 0.86 0.82 0.87 0.90

2002-2011 1.92 2.03 2.05 2.06 2.14 2.03 2.03 2.00 1.99 2.02 2.03 2.00

1992-2001 1.55 1.46 1.49 1.56 1.42 1.54 1.50 1.53 1.56 1.54 1.53 1.54

1982-1991 1.60 1.66 1.56 1.54 1.58 1.51 1.56 1.54 1.52 1.55 1.58 1.60

1972-1981 1.28 1.23 1.32 1.27 1.34 1.36 1.30 1.28 1.30 1.29 1.32 1.32

1962-1971 0.86 0.90 0.93 0.91 0.80 0.81 0.82 0.88 0.89 0.93 0.90 0.89

2001-2010 1.88 1.84 1.92 1.85 1.94 1.91 1.86 1.91 1.99 1.90 1.93 1.92

1991-2000 1.52 1.57 1.58 1.54 1.49 1.50 1.53 1.53 1.49 1.51 1.52 1.52

1981-1990 1.67 1.66 1.57 1.67 1.69 1.61 1.64 1.60 1.61 1.62 1.62 1.61

1971-1980 1.22 1.22 1.25 1.23 1.17 1.24 1.17 1.19 1.16 1.23 1.24 1.27

1961-1970 0.84 0.80 0.89 0.89 0.90 0.86 0.93 0.89 0.85 0.85 0.81 0.85

This CO2Now worksheet was produced using the "Interpolated CO2" column in the "NOAA-ESRL Dataset" worksheet.

Atmospheric CO2 | Decadal Rate of Change | NOAA-ESRL

Monthly Year Over Year CO2 Concentrations (10 Year Averages)Scripps data from March 1958 - April 1974 | NOAA-ESRL data since May 1974

Latest data posted by NOAA: September 5, 2012

Documents

Co2 Mlo Monthly Noaa Esrl