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3月9日 · CO2.Earth connects the general public with the latest data and information for stabilizing earth's atmosphere, climate and living environments.

Average annual atmospheric levels of carbon dioxide (CO₂) reached a record high of 424.61 parts per million (ppm) in 2024. Monthly atmospheric CO₂ concentrations peaked that year in June, at...

2025年3月5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1月21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.

2025年3月7日 · CO2 PPM = (0.002 / 10) * 1,000,000 = 200 PPM. FAQs. 1. What is CO2 PPM? CO2 PPM refers to the concentration of carbon dioxide in air, measured in parts per million. 2. Why is CO2 concentration important? Monitoring CO2 levels helps ensure proper ventilation, air quality, and safety in enclosed spaces. 3. What is a safe CO2 PPM level?

423.85 ppm CO2 in atmosphere in November 2024 at the Mauna Loa Observatory. Monthly comparison of CO2 levels measured by NOAA & Scripps at Mauna Loa. Plus global averages.