Oxygen has the most varying atmospheric concentration compared to other gases like methane, argon, and nitrogen.
Oxygen has the most varying concentration in its atmospheric presence compared to methane, argon, and nitrogen. Ozone, for instance, fluctuates in concentration due to factors like time of day, O atoms from other sources, and altitude. On the other hand, carbon dioxide has a fairly uniform global presence but is increasing yearly due to fossil fuel burning.
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