Monthly average surpassed 414 ppm at NOAA's Mauna Loa Observatory in Hawaii
Monthly average surpassed 414 ppm at NOAA's Mauna Loa Observatory in Hawaii
Atmospheric carbon dioxide continued its rapid rise in 2019, with the average for May peaking at 414.7 parts per million (ppm) at NOAA’s Mauna Loa Atmospheric Baseline Observatory.