Co2 Ppm Levels 2025 By State. Global average annual mean co 2 concentration reached 419.2 parts per million (ppm) in 2023. Carbon dioxide in the atmosphere warms the planet, causing climate change.
Carbon dioxide measured at noaa’s mauna loa atmospheric baseline observatory surged to a seasonal peak of just under 427 parts per million (426.90 ppm) in. The increase is being driven by human activities, such as extraction and burning of fossil fuels (e.g.