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Monthly CO2www.co2.earth 426.90 ppm CO2 in atmosphere in May 2024 at the Mauna Loa Observatory. Monthly comparison of CO2 levels measured by NOAA & Scripps at Mauna Loa. Plus global averages.
Annual CO₂ emissionsourworldindata.org Carbon dioxide (CO₂) emissions from fossil fuels and industry. Land-use change is not included.