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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 | Jul. 23, 2025 |
| Estimated next update | Aug. 21, 2026 |
| Original Source | NOAA Global Monitoring Laboratory |
| Sample File | Sample_CSV__Greenhouse_Gas_Concentration_Levels.zip |
| Number of records | 398 |
| Values Missing or Not Reported | 3.3% |
| File Size | 51.8 KB |
| Latest data available | June, 2025 |
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Source (APA): |
StatsUSA. (2025, July 23). Greenhouse Gas Concentration Levels. https://statsusa.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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APA
Format or style, from the American Psychological Association, is commonly used for footnotes in behavioral and social science publications. APA citation is an author-year-system. It is one of the most common styles used and taught at colleges and high schools. See here for more details, including APA formatting for bibliographies.Chicago
Format or style (also known as Turabian), created by the University of Chicago, is commonly used for footnotes in history, business, and fine arts and occasionally in the humanities, sciences, and social sciences. The Chicago style has two systems of citation. The author-date system (most common in social sciences and sciences) cites sources parenthetically in the text. The notes and bibliography system (most common in humanities) cites sources in numbered footnotes or endnotes which correspond to a superscript number in the text. See here for more details, including Chicago formatting for bibliographies.MLA
Modern Language Association (MLA) format or style is most commonly used for footnotes in the language arts, cultural studies, liberal arts, and humanities. MLA uses short parenthetical citations within the text that are linked to an alphabetical list of work cited at the end of the document. MLA commonly cites using this format: author's last name, first name, title, publication, edition or chapter, and year. See here for more details, including MLA formatting for bibliographies.AMA
American Medical Association (AMA) format or style is most commonly used for footnotes in medicine, biomedical research, nursing, dentistry, and other life sciences. AMA uses numerical superscript for citing sources in-text and refers to a list at the end of the work. These references appear in sequential order of when the sources were cited, instead of alphabetical order. See here for more details, including AMA formatting for bibliographies.
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