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Data source: NOAA GML (Mauna Loa Observatory) Units: parts per million (ppm) This table presents the latest, daily average reading for atmospheric CO2 on the planet. Updates happen once a day with few exceptions. CO2 Is The Number to Watch.
Data are reported as a dry air mole fraction defined as the number of molecules of carbon dioxide divided by the number of all molecules in air, including CO 2 itself, after water vapor has been removed. The mole fraction is expressed as parts per million (ppm).
October 06: 422.27 ppm. Last Updated: October 11, 2024. Hourly (red circles) and Daily (yellow circles) averaged CO 2 values from Mauna Loa, Hawaii for the last 31 days. The graph, updated daily, shows as individual points daily and hourly mean CO 2 for the last 31 days.
Based on the annual report from NOAA’s Global Monitoring Lab, global average atmospheric carbon dioxide was 419.3 parts per million (“ppm” for short) in 2023, setting a new record high.
The animated map shows how the historical changes in global carbon dioxide over time. Note the colors change as the amount of CO 2 rises from 365 parts per million (ppm) in 2002 to over 420 ppm currently.
Between 1979-2024, the concentration of carbon dioxide (CO2) in Earth's atmosphere has increased from an average of 336.56 PPM to 421.2 PPM (parts per million), a 25.15% increase during a 45 year time span.
The data contains concentrations of carbon dioxide in the atmosphere from hundreds of thousands of years ago through 2021, measured in parts per million (ppm). The data come from a variety of historical ice core studies and recent air monitoring sites around the world.
Atmospheric carbon dioxide (CO₂) concentration is measured in parts per million (ppm).
CO2.Earth connects the general public with the latest data and information for stabilizing earth's atmosphere, climate and living environments.
Levels of carbon dioxide (CO 2) measured at NOAA’s Mauna Loa Atmospheric Baseline Observatory by NOAA’s Global Monitoring Laboratory surged to a seasonal peak of just under 427 parts per million (426.90 ppm) in May, when CO 2 reaches its highest level in the Northern Hemisphere.