Carbon Dioxide at 411 ppm April 9, 2019 / activist360 / Leave a comment Latest Measurement: February 2019 Carbon dioxide (CO2) is released through deforestation, burning fossil fuels and volcanic eruptions. It is important to track because it traps greenhouse gas. The above chart by NASA NOAA shows CO2 levels measured at Mauna Loa Observatory, Hawaii, in recent years, with average seasonal cycle removed.