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In 2009, the average concentration for atmospheric CO2 (Mauna Loa Observatory) was 387.35 parts per million (ppm). In 2008, it was 385.57 ppm. Since the 1958 start of precise CO2 measurements in the atmosphere, the annual mean concentration of CO2 has only increased from one year to the next. There have been no decreases in annual CO2 levels since direct instrument measurements began. The following CO2 data provides a snapshot of the longest-running, high-precision instrument record for atmospheric CO2: Year CO2 (ppm) Notes 2009 387.35 Copenhagen Accord 2008 385.57 The latest year for which a full year of data is available 2007 383.71 2006 381.85
1992 356.27 Earth Summit in Rio de Janeiro 1987 348.98 The last year in which the annual CO2 data was less than 350 ppm 1959 315.98 The first year for which a full year of precise instrument data is available
More Information: Annual and monthly data for atmospheric CO2 | 1958 - present | MLO / Scripps & NOAA Accelerating rise of atmospheric CO2 Seasonal fluctuation in atmospheric CO2 Monthly data for atmospheric CO2
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