Increases in carbon dioxide are offset by decreases in oxygen consequently, the oxygen percentage in 2036 is projected to be 20.9352. Carbon dioxide reached 0.0379 in 2005, is currently increasing by 0.00019 percent per year and is projected to reach 0.0438 in 2036 (Gatley et al. Harrison (1965) and Hyland and Wexler (1983a) used a value 0.0314 (circa 1955) for carbon dioxide. Harrison (1965) lists the approximate percentage composition of dry air by volume as: nitrogen, 78.084 oxygen, 20.9476 argon, 0.934 neon, 0.001818 helium, 0.000524 methane, 0.00015 sulfur dioxide, 0 to 0.0001 hydrogen, 0.00005 and minor components such as krypton, xenon, and ozone, 0.0002. Its composition is relatively constant, but small variations in the amounts of individual components occur with time, geographic location, and altitude. Atmospheric air contains many gaseous components as well as water vapor and miscellaneous contaminants (e.g., smoke, pollen, and gaseous pollutants not normally present in free air far from pollution sources).ĭry air is atmospheric air with all water vapor and contaminants removed.
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