Greenhouse gas measurements reached new highs in 2025
Adrian Solmere
Updated: Oct 29, 2026
Atmospheric concentrations of the three major long-lived
greenhouse gases reached record levels in 2025, according to the World Meteorological Organization.
Its latest Greenhouse Gas Bulletin reported globally averaged surface
carbon dioxide concentrations of 426.8±0.2 ppm.
Methane reached 1 948±2 ppb, while nitrous oxide reached 339.1±0.1 ppb.
The measurements represented increases above pre-industrial levels of 53%, 167% and 26%, respectively.
WMO said the continuing accumulation of
greenhouse gases commits the planet to further
long-term warming.
The bulletin measures atmospheric concentrations, the amount of gas present in the atmosphere, rather than the quantity newly emitted during a single year.
The results draw on observations from the organisation’s
Global Atmosphere Watch network.
