NOAA JUST IN: Atmospheric carbon dioxide (CO2) concentrations have peaked for the year at 430.5 ppm.
NOAA Office of Oceanic and Atmospheric Research JUST IN: Atmospheric carbon dioxide (CO2) concentrations have peaked for the year at 430.5 ppm. The 2025 peak is 3.6 ppm higher than last year and the second largest May-May increase in the 67-year Mauna Loa record. In 2023, the CO2 peaked at
June 11, 2025