Baseline reading not available, data too variable 01-Oct-2025 keelingcurve.ucsd.edu

424.15 parts per million (ppm) CO2 in air 29-Sep-2025

Communication down 28-Sep-2025 keelingcurve.ucsd.edu

Baseline reading not available, data too variable 27-Sep-2025 keelingcurve.ucsd.edu

423.91 parts per million (ppm) CO2 in air 26-Sep-2025 keelingcurve.ucsd.edu

423.18 parts per million (ppm) CO2 in air 25-Sep-2025 keelingcurve.ucsd.edu

423.85 parts per million (ppm) CO2 in air 24-Sep-2025 keelingcurve.ucsd.edu

423.62 parts per million (ppm) CO2 in air 23-Sep-2025 keelingcurve.ucsd.edu

423.72 parts per million (ppm) CO2 in air 22-Sep-2025 keelingcurve.ucsd.edu

423.72 parts per million (ppm) CO2 in air 21-Sep-2025 keelingcurve.ucsd.edu

423.58 parts per million (ppm) CO2 in air 20-Sep-2025 keelingcurve.ucsd.edu

424.06 parts per million (ppm) CO2 in air 19-Sep-2025 keelingcurve.ucsd.edu

423.05 parts per million (ppm) CO2 in air 17-Sep-2025 keelingcurve.ucsd.edu

Baseline reading not available, data too variable 16-Sep-2025 keelingcurve.ucsd.edu

Baseline reading not available, data too variable 15-Sep-2025 keelingcurve.ucsd.edu

423.84 parts per million (ppm) CO2 in air 13-Sep-2025 keelingcurve.ucsd.edu

424.15 parts per million (ppm) CO2 in air 12-Sep-2025 keelingcurve.ucsd.edu

424.15 parts per million (ppm) CO2 in air 11-Sep-2025 keelingcurve.ucsd.edu

424.60 parts per million (ppm) CO2 in air 10-Sep-2025 keelingcurve.ucsd.edu

423.11 parts per million (ppm) CO2 in air 09-Sep-2025 keelingcurve.ucsd.edu

Baseline reading not available, data too variable 08-Sep-2025 keelingcurve.ucsd.edu

424.11 parts per million (ppm) CO2 in air 07-Sep-2025 keelingcurve.ucsd.edu

423.73 parts per million (ppm) CO2 in air 06-Sep-2025 keelingcurve.ucsd.edu

424.70 parts per million (ppm) CO2 in air 05-Sep-2025 keelingcurve.ucsd.edu

425.08 parts per million (ppm) CO2 in air 04-Sep-2025 keelingcurve.ucsd.edu

425.39 parts per million (ppm) CO2 in air 03-Sep-2025 keelingcurve.ucsd.edu

Baseline reading not available, data too variable 02-Sep-2025 keelingcurve.ucsd.edu

423.96 parts per million (ppm) CO2 in air 01-Sep-2025 keelingcurve.ucsd.edu

Baseline reading not available, data too variable 31-Aug-2025 keelingcurve.ucsd.edu

Baseline reading not available, data too variable 30-Aug-2025 keelingcurve.ucsd.edu

Baseline reading not available, data too variable 29-Aug-2025 keelingcurve.ucsd.edu

Baseline reading not available, data too variable 28-Aug-2025 keelingcurve.ucsd.edu

424.83 parts per million (ppm) CO2 in air 27-Aug-2025 keelingcurve.ucsd.edu

424.87 parts per million (ppm) CO2 in air 26-Aug-2025 keelingcurve.ucsd.edu

424.87 parts per million (ppm) CO2 in air 26-Aug-2025 keelingcurve.ucsd.edu

424.32 parts per million (ppm) CO2 in air 25-Aug-2025 keelingcurve.ucsd.edu

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Baseline reading not available, data too variable 24-Aug-2025 keelingcurve.ucsd.edu

425.23 parts per million (ppm) CO2 in air 23-Aug-2025 keelingcurve.ucsd.edu

425.60 parts per million (ppm) CO2 in air 22-Aug-2025 keelingcurve.ucsd.edu

425.49 parts per million (ppm) CO2 in air 21-Aug-2025 keelingcurve.ucsd.edu

425.51 parts per million (ppm) CO2 in air 20-Aug-2025 keelingcurve.ucsd.edu

425.29 parts per million (ppm) CO2 in air 19-Aug-2025 keelingcurve.ucsd.edu

425.24 parts per million (ppm) CO2 in air 18-Aug-2025 keelingcurve.ucsd.edu

Baseline reading not available, data too variable 17-Aug-2025 keelingcurve.ucsd.edu

424.90 parts per million (ppm) CO2 in air 16-Aug-2025 keelingcurve.ucsd.edu

425.10 parts per million (ppm) CO2 in air 15-Aug-2025 keelingcurve.ucsd.edu

Communication down 14-Aug-2025 keelingcurve.ucsd.edu

Communication down 13-Aug-2025 keelingcurve.ucsd.edu

425.11 parts per million (ppm) CO2 in air 12-Aug-2025 keelingcurve.ucsd.edu