What will be the mean annual CO2 level in 2024?
Mini
3
112
2025
424
expected

Resolution according to CO2 measurements in ppm and the calculation of annual means from Global Monitoring Laboratory at Mauna Loa Observatory.

Graphs of historic CO2 measurements at Mauna Loa are here:

https://gml.noaa.gov/ccgg/trends/mlo.html

The data for historic annual means are here:

https://gml.noaa.gov/webdata/ccgg/trends/co2/co2_annmean_mlo.txt

Mean data will be rounded up or down for resolution.

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Annual number is typically quite close to March of same year number. March 2024 was 425.38 but that isn't guaranteed. Do your own research ;)