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Greenhouse Gas Concentration Levels
Database Detail
| Name | Greenhouse Gas Concentration Levels |
| Summary | Globally-averaged CO2, CH4, N2O, SF6 levels |
| Additional Background |
This database contains monthly readings for Greenhouse Gases (GHG) Carbon Dioxide (CO2), Methane (CH4), Nitrous Oxide (N2O), and Sulfur Hexafluoride (SF6). CO2 levels indicate the average measurement, in parts per million (ppm), at the Mauna Loa and Maunakea Observatories in Hawaii. Monthly values are also reported as deseasonalized to account for seasonal cycles since Hawaii observatories are located in the Northern Hemisphere and are affected by seasonal CO2 variations. CO2 values begin in 1958.
Methane (CH4) values reflect globally-averaged, monthly mean atmospheric methane abundance determined from marine surface sites and are reported in parts per billion (ppb). CH4 values begin in 1983. CH4 values generally lag CO2 values by 2-3 months.
Nitrous Oxide (N2O) values reflect globally-averaged, monthly mean atmospheric methane abundance determined from a globally distributed network of air sampling sites and are reported in parts per billion (ppb). N2O begin in 2001. N2O values generally lag CO2 values by 2-3 months.
Sulfur Hexafluoride (SF6) values reflect globally-averaged, monthly mean atmospheric methane abundance determined from marine surface sites and are reported in parts per trillion (ppt). SF6 values begin in 2001. SF6 values generally lag CO2 values by 2-3 months.
For all gases, data for recent time periods are preliminary and subject to change. For additional information, see Trends in CO2, CH4, N2O, SF6. For background on GHG generally, see Understanding Global Warming Potentials.
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| Geographic Coverage | U.S. |
| Periodicity | Monthly |
| Series Begins/Ends | 1958 - 2025 |
| Data Source | NOAA Global Monitoring Laboratory |
| Summary | Globally-averaged CO2, CH4, N2O, SF6 levels |
| Geographic Coverage | U.S. |
| Series Begins/Ends | 1958 - 2025 |
| Reporting Period | Monthly |
| New Database added | Mar. 18, 2025 |
| Estimated next update | Mar. 21, 2026 |
| Original Source | NOAA Global Monitoring Laboratory |
| Sample File | Sample_CSV__Greenhouse_Gas_Concentration_Levels.zip |
| Number of records | 392 |
| Values Missing or Not Reported | 0.5% |
| File Size | 0.1MB |
| Latest data available | February, 2025 |
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Source (APA): |
State Statistics. (2025, March 18). Greenhouse Gas Concentration Levels. https://statestatistics.org/us/stats/greenhouse-gas-concentration-levels.html
Set APA as default format
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This database contains monthly readings for Greenhouse Gases (GHG) Carbon Dioxide (CO2), Methane (CH4), Nitrous Oxide (N2O), and Sulfur Hexafluoride (SF6). CO2 levels indicate the average measurement, in parts per million (ppm), at the Mauna Loa and Maunakea Observatories in Hawaii. Monthly values are also reported as deseasonalized to account for seasonal cycles since Hawaii observatories are located in the Northern Hemisphere and are affected by seasonal CO2 variations. CO2 values begin in 1958.
Methane (CH4) values reflect globally-averaged, monthly mean atmospheric methane abundance determined from marine surface sites and are reported in parts per billion (ppb). CH4 values begin in 1983. CH4 values generally lag CO2 values by 2-3 months.
Nitrous Oxide (N2O) values reflect globally-averaged, monthly mean atmospheric methane abundance determined from a globally distributed network of air sampling sites and are reported in parts per billion (ppb). N2O begin in 2001. N2O values generally lag CO2 values by 2-3 months.
Sulfur Hexafluoride (SF6) values reflect globally-averaged, monthly mean atmospheric methane abundance determined from marine surface sites and are reported in parts per trillion (ppt). SF6 values begin in 2001. SF6 values generally lag CO2 values by 2-3 months.
For all gases, data for recent time periods are preliminary and subject to change. For additional information, see Trends in CO2, CH4, N2O, SF6. For background on GHG generally, see Understanding Global Warming Potentials.
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