Daily CO2

Mauna Loa Observatory  |  Atmospheric CO2 Concentrations

February 6, 2016

405.98 ppm

February 6, 2015

401.03 ppm

 Scripps CO2 UCSD

daily mean concentrations  |  ppm = parts per million


When available, daily average values for carbon dioxide in the atmosphere are posted here as a year-over-year comparison.  Measurements are made by two independent CO2 monitoring programs (NOAA and Scripps) at the Mauna Loa Observatory in Hawaii, about 3400 metres above sea level.

CO2.Earth presents a year-over-year comparison of recent daily readings for public education purposes.  Tracking these readings can provide opportunities for in-the-moment learning about the seasnal cycle and trend for atmospheric CO2.  See the "notes" tab on this page for important information about the daily CO2 data reposted here.

Explore the tabs below to view visuals and links associated with the latest CO2 readings from Mauna Loa.


CO2 Past.  CO2 Present.  CO2 Future.