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: 2:35:04 AM on Jul. 26, 2024, Hawaii local time (UTC -10)
| Latest | One year ago | Change from previous year | ||
|---|---|---|---|---|
| Date | Reading | Date | Reading | |
| Jul. 25, 2024 | 425.10 ppm | Jul. 26, 2023 | 422.66 ppm | 2.44 ppm increase (0.58 %) |
| Jul. 24, 2024 | 424.70 ppm | Jul. 25, 2023 | 422.04 ppm | 2.66 ppm increase (0.63 %) |
| Jul. 23, 2024 | 424.47 ppm | Jul. 24, 2023 | 422.17 ppm | 2.30 ppm increase (0.54 %) |
| Jul. 22, 2024 | Unavailable | Jul. 23, 2023 | 422.44 ppm | n/a |
| Jul. 21, 2024 | 425.20 ppm | Jul. 22, 2023 | 422.64 ppm | 2.56 ppm increase (0.61 %) |
| Jul. 20, 2024 | 426.11 ppm | Jul. 21, 2023 | 422.45 ppm | 3.66 ppm increase (0.87 %) |
| Jul. 19, 2024 | Unavailable | Jul. 20, 2023 | 420.79 ppm | n/a |
| Jul. 18, 2024 | 424.83 ppm | Jul. 19, 2023 | 421.41 ppm | 3.42 ppm increase (0.81 %) |
| Jul. 17, 2024 | Unavailable | Jul. 18, 2023 | 422.14 ppm | n/a |
| Jul. 16, 2024 | 425.79 ppm | Jul. 17, 2023 | 420.92 ppm | 4.87 ppm increase (1.16 %) |