Free dataset
CO₂ kept climbing: Mauna Loa
67 annual CO₂ readings, 1959–2025. Concentration, not emissions. Maunakea observations temporarily replace Mauna Loa in 2022–2023; values may be revised. Movement between years is interpolated. The labeled chart scale starts at 300 ppm.
A sample of the data
| Year | Series | CO2_ppm |
|---|---|---|
| 1959 | Mauna Loa | 315.98 |
| 1960 | Mauna Loa | 316.91 |
| 1961 | Mauna Loa | 317.64 |
| 1962 | Mauna Loa | 318.45 |
| 1963 | Mauna Loa | 318.99 |
| 1964 | Mauna Loa | 319.62 |
| 1965 | Mauna Loa | 320.04 |
| 1966 | Mauna Loa | 321.37 |