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.

In Earth's atmosphere, carbon dioxide is a trace gas that plays an integral part in the greenhouse effect, carbon cycle, photosynthesis and oceanic carbon cycle. It is one of three main greenhouse gases in the atmosphere of Earth.

2024年4月9日 · 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.

Note the colors change as the amount of CO 2 rises from 365 parts per million (ppm) in 2002 to over 420 ppm currently. It's important to understand that “parts per million” refers to the number of carbon dioxide molecules per million molecules of dry air.

2024年4月1日 · CO2.Earth connects the general public with the latest data and information for stabilizing earth's atmosphere, climate and living environments.

2025年3月14日 · 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).

2025年3月17日 · Atmospheric carbon dioxide (CO₂) concentration is measured in parts per million (ppm). Long-term trends in CO₂ concentrations can be measured at high-resolution using preserved air samples from ice cores.

2023年3月16日 · The fresh air we inhale will typically have about 400 ppm of background CO2 with the life sustaining oxygen of the atmosphere. By measuring your indoor air quality and CO2 ppm levels you can further mitigate air borne illnesses, lack …

Between 1979-2024, the concentration of carbon dioxide (CO2) in Earth's atmosphere has increased from an average of 336.56 PPM to 425.19 PPM (parts per million), a 26.33% increase during a 45 year time span.

The modern record of atmospheric carbon dioxide levels began with observations recorded at Mauna Loa Observatory in Hawaii. This graph shows the station's monthly average carbon dioxide measurements since 1958 in parts per million (ppm).