What percentage of atmospheric air consists of gases other than oxygen or nitrogen?

The correct answer is based on the composition of Earth's atmosphere, which is primarily made up of nitrogen (about 78%) and oxygen (about 21%). The remaining gases, which include argon (around 0.93%), carbon dioxide (approximately 0.04%), neon, helium, methane, krypton, hydrogen, xenon, and others, collectively constitute about 1% of the atmosphere. This small percentage encompasses a variety of trace gases that play important roles in various atmospheric and biological processes. Understanding this composition is crucial for studying fire behavior, as the presence of these trace gases can impact combustion and the spread of fire.