Greenhouse Gas Bulletin - No. 21

The latest analysis of observations from the WMO Global Atmosphere Watch (GAW) in situ observational network shows that the globally averaged surface concentrations for carbon dioxide (CO₂), methane (CH₄) and nitrous oxide (N₂O) reached unprecedented highs in 2024, with CO₂ at 423.9±0.2 ppm, CH₄ at 1942±2 ppb and N₂O at 338.0±0.1 ppb.