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The typical trace composition of air includes a variety of gases, with nitrogen and oxygen making up the majority. Among the trace gases, argon is a significant component, typically found in concentrations of about 0.93% of the atmosphere. Carbon dioxide also plays a role, as it is present in much smaller amounts, approximately 0.04% but it has great importance due to its effect on climate and life processes, such as photosynthesis.

Additionally, hydrogen and other rare gases (like neon, helium, krypton, and xenon) contribute to the overall trace composition. While these gases are found in even smaller amounts compared to carbon dioxide and argon, they are part of the overall mixture that constitutes atmospheric air.

Thus, the inclusion of all these factors illustrates why all the mentioned gases – carbon dioxide, argon, hydrogen, and other rare gases – are considered when discussing the trace composition of air. This comprehensive view highlights the complexity of air's makeup and emphasizes the importance of understanding not just the primary components, but also those present in minor quantities.