Daily CO2 readings are updated here automatically with the latest atmospheric CO2 readings available from the Mauna Loa Observatory in Hawaii.
Data sources:
March 1958 to April 1974: Scripps Institution of Oceanography, May 1974 to present day: Dr. Pieter Tans, NOAA/GML
Last update: 3:35:02 AM on Dec. 26, 2024, Hawaii local time (UTC -10)
| Latest | One year ago | Change from previous year | ||
|---|---|---|---|---|
| Date | Reading | Date | Reading | |
| Dec. 25, 2024 | 425.60 ppm | Dec. 26, 2023 | 421.51 ppm | 4.09 ppm increase (0.97 %) |
| Dec. 24, 2024 | 425.43 ppm | Dec. 25, 2023 | Unavailable | n/a |
| Dec. 23, 2024 | 425.49 ppm | Dec. 24, 2023 | Unavailable | n/a |
| Dec. 22, 2024 | 425.70 ppm | Dec. 23, 2023 | Unavailable | n/a |
| Dec. 21, 2024 | Unavailable | Dec. 22, 2023 | Unavailable | n/a |
| Dec. 20, 2024 | 425.76 ppm | Dec. 21, 2023 | 422.02 ppm | 3.74 ppm increase (0.89 %) |
| Dec. 19, 2024 | 425.04 ppm | Dec. 20, 2023 | 422.09 ppm | 2.95 ppm increase (0.70 %) |
| Dec. 18, 2024 | 424.61 ppm | Dec. 19, 2023 | 422.03 ppm | 2.58 ppm increase (0.61 %) |
| Dec. 17, 2024 | 424.34 ppm | Dec. 18, 2023 | 422.38 ppm | 1.96 ppm increase (0.46 %) |