The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

429.66 parts per million (ppm) CO2 in air 20-Apr-2026. Keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

430.08 parts per million (ppm) CO2 in air 19-Apr-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

430.01 parts per million (ppm) CO2 in air 18-Apr-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

429.70 parts per million (ppm) CO2 in air 17-Apr-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

429.62 parts per million (ppm) CO2 in air 16-Apr-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

429.31 parts per million (ppm) CO2 in air 15-Apr-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

429.02 parts per million (ppm) CO2 in air 14-Apr-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

429.37 parts per million (ppm) CO2 in air 13-Apr-2026
keelingcurve.ucsd.edu

How are CO2 Data Processed? Scientists make CO2 measurements in remote locations to obtain air that is representative of a large volume of Earth's atmosphere and relatively free from local influences that could skew readings. Th...

For days like this with no reading, this blast from the past explains what makes data “too variable”: keelingcurve.ucsd.edu/2014/07/28/h...

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

Baseline reading not available, data too variable 12-Apr-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

430.99 parts per million (ppm) CO2 in air 11-Apr-2026
keelingcurve.ucsd.edu

429.77 parts per million (ppm) CO2 in air 10-Apr-2026
keelingcurve.ucsd.edu

Baseline reading not available, data too variable 09-Apr-2026
keelingcurve.ucsd.edu

431.65 parts per million (ppm) CO2 in air 08-Apr-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

Baseline reading not available, data too variable 07-Apr-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

Baseline reading not available, data too variable 06-Apr-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

Baseline reading not available, data too variable 05-Apr-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

431.15 parts per million (ppm) CO2 in air 04-Apr-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

430.98 parts per million (ppm) CO2 in air 03-Apr-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

431.09 parts per million (ppm) CO2 in air 02-Apr-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

432.08 parts per million (ppm) CO2 in air 01-Apr-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

432.81 parts per million (ppm) CO2 in air 31-Mar-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

Baseline reading not available, data too variable 30-Mar-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

431.32 parts per million (ppm) CO2 in air 29-Mar-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

431.76 parts per million (ppm) CO2 in air 28-Mar-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

431.44 parts per million (ppm) CO2 in air 27-Mar-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

431.28 parts per million (ppm) CO2 in air 26-Mar-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

431.28 parts per million (ppm) CO2 in air 25-Mar-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

431.59 parts per million (ppm) CO2 in air 24-Mar-2026
keelingcurve.ucsd.edu

The Keeling Curve The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

429.79 parts per million (ppm) CO2 in air 22-Mar-2026
keelingcurve.ucsd.edu