Carbon dioxide in the atmosphere peaked more than 50% higher than pre-industrial levels in May, comparable to levels observed around 4 million years ago, according to the National Oceanic and Atmospheric Administration (NOAA).
Carbon dioxide recorded at NOAA’s Mauna Loa Atmospheric Baseline Observatory peaked for 2022 in May at 421 parts per million (ppm), up 1.8 ppm from 2021. A monthly average of 420.78 ppm was calculated by scientists at the Scripps Institution of Oceanography at the University of California San Diego.
