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. 2022 Mar 11;9:83. doi: 10.1038/s41597-022-01196-7

Table 2.

Multi-year average atmospheric CO2 concentrations in various historical periods for some countries.

Regional CO2 concentrations (ppm) 1861–1880 1901–1920 1941–1960 1981–2000 2004–2013
Australia 287.83 299.66 313.07 353.11 384.32
Brazil 287.53 299.79 313.66 354.54 385.71
Canada 287.59 300.12 314.04 355.73 388.46
China 287.60 300.04 313.87 356.59 391.16
India 287.57 300.52 314.55 356.56 389.25
United States 287.83 300.8 314.61 356.25 389.99
United Kingdom 290.90 303.38 317.29 358.73 391.65