Greenhouse gases
- Carbon dioxide (CO₂), Mauna Loa428.25 ppmMauna Loa Observatory daily mean CO₂
- Methane (CH₄), global1,934.57 ppbGlobally-averaged monthly mean CH₄
- Nitrous oxide (N₂O), global339.86 ppbGlobally-averaged monthly mean N₂O
Carbon dioxide (CO₂) at the Mauna Loa Observatory in Hawaii, the record known as the Keeling Curve, measured by NOAA's Global Monitoring Laboratory (GML) and the Scripps Institution of Oceanography, in parts per million (ppm). Methane (CH₄) and nitrous oxide (N₂O) in the atmosphere, averaged over the globe, in parts per billion (ppb).
Data table: Carbon dioxide (CO₂), Mauna Loa
| Date | Parts per million (ppm) |
|---|---|
| 428.25 ppm | |
| 427.90 ppm | |
| 427.20 ppm | |
| 427.25 ppm | |
| 427.02 ppm | |
| 427.18 ppm | |
| 427.13 ppm | |
| 426.96 ppm | |
| 426.77 ppm | |
| 426.46 ppm | |
| 426.85 ppm | |
| 426.65 ppm | |
| 426.73 ppm | |
| 426.67 ppm | |
| 427.25 ppm | |
| 426.71 ppm | |
| 426.84 ppm | |
| 427.01 ppm | |
| 426.78 ppm | |
| 426.56 ppm | |
| 426.40 ppm | |
| 426.43 ppm | |
| 426.39 ppm | |
| 426.21 ppm | |
| 425.89 ppm | |
| 425.30 ppm | |
| 425.84 ppm | |
| 425.81 ppm | |
| 425.75 ppm | |
| 425.95 ppm | |
| 425.80 ppm | |
| 425.22 ppm | |
| 426.32 ppm | |
| 426.42 ppm | |
| 426.40 ppm | |
| 426.53 ppm | |
| 425.53 ppm | |
| 425.57 ppm | |
| 425.04 ppm | |
| 425.23 ppm | |
| 425.73 ppm | |
| 426.25 ppm | |
| 426.62 ppm | |
| 426.57 ppm | |
| 427.13 ppm | |
| 426.81 ppm | |
| 427.33 ppm | |
| 427.32 ppm | |
| 426.93 ppm | |
| 427.01 ppm | |
| 427.03 ppm | |
| 426.87 ppm |
Data table: Methane (CH₄), global
| Date | Parts per billion (ppb) |
|---|---|
| 1,934.57 ppb | |
| 1,939.61 ppb | |
| 1,937.57 ppb | |
| 1,936.88 ppb | |
| 1,939.48 ppb | |
| 1,940.79 ppb | |
| 1,942.64 ppb | |
| 1,945.51 ppb | |
| 1,944.98 ppb | |
| 1,939.25 ppb | |
| 1,931.55 ppb | |
| 1,927.36 ppb | |
| 1,929.17 ppb | |
| 1,933.35 ppb | |
| 1,934.67 ppb | |
| 1,934.04 ppb | |
| 1,934.50 ppb | |
| 1,935.89 ppb | |
| 1,937.73 ppb | |
| 1,940.13 ppb | |
| 1,940.74 ppb | |
| 1,934.33 ppb | |
| 1,924.88 ppb | |
| 1,920.43 ppb | |
| 1,921.44 ppb | |
| 1,925.53 ppb | |
| 1,928.32 ppb | |
| 1,926.91 ppb | |
| 1,925.64 ppb | |
| 1,928.26 ppb | |
| 1,931.23 ppb | |
| 1,931.58 ppb | |
| 1,930.14 ppb | |
| 1,924.47 ppb | |
| 1,916.75 ppb | |
| 1,912.96 ppb | |
| 1,915.05 ppb | |
| 1,919.04 ppb | |
| 1,919.66 ppb | |
| 1,918.78 ppb | |
| 1,918.98 ppb | |
| 1,920.01 ppb | |
| 1,922.21 ppb | |
| 1,922.31 ppb | |
| 1,919.51 ppb | |
| 1,915.11 ppb | |
| 1,908.37 ppb | |
| 1,904.04 ppb | |
| 1,904.89 ppb | |
| 1,907.55 ppb | |
| 1,908.89 ppb | |
| 1,907.83 ppb |
Data table: Nitrous oxide (N₂O), global
| Date | Parts per billion (ppb) |
|---|---|
| 339.86 ppb | |
| 339.83 ppb | |
| 339.79 ppb | |
| 339.77 ppb | |
| 339.76 ppb | |
| 339.74 ppb | |
| 339.65 ppb | |
| 339.47 ppb | |
| 339.21 ppb | |
| 338.99 ppb | |
| 338.87 ppb | |
| 338.77 ppb | |
| 338.68 ppb | |
| 338.66 ppb | |
| 338.65 ppb | |
| 338.60 ppb | |
| 338.52 ppb | |
| 338.44 ppb | |
| 338.30 ppb | |
| 338.10 ppb | |
| 337.86 ppb | |
| 337.68 ppb | |
| 337.63 ppb | |
| 337.67 ppb | |
| 337.70 ppb | |
| 337.67 ppb | |
| 337.61 ppb | |
| 337.58 ppb | |
| 337.55 ppb | |
| 337.47 ppb | |
| 337.31 ppb | |
| 337.10 ppb | |
| 336.90 ppb | |
| 336.74 ppb | |
| 336.66 ppb | |
| 336.61 ppb | |
| 336.57 ppb | |
| 336.55 ppb | |
| 336.56 ppb | |
| 336.54 ppb | |
| 336.50 ppb | |
| 336.42 ppb | |
| 336.30 ppb | |
| 336.13 ppb | |
| 335.93 ppb | |
| 335.76 ppb | |
| 335.64 ppb | |
| 335.55 ppb | |
| 335.49 ppb | |
| 335.46 ppb | |
| 335.44 ppb | |
| 335.39 ppb |
Source: Dr. Xin Lan, NOAA/GML (gml.noaa.gov/ccgg/trends/) and Dr. Ralph Keeling, Scripps Institution of Oceanography (scrippsco2.ucsd.edu/)
Source: Lan, X., K.W. Thoning, and E.J. Dlugokencky (2022): Trends in globally-averaged CH4, N2O, and SF6 determined from NOAA Global Monitoring Laboratory measurements. Version 2026-10, https://doi.org/10.15138/P8XG-AA10