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Question

Which two gases dominate Earth's surface atmosphere?

This question was previously asked in
SSC CGL 2025 Tier 2 Paper 1 Question Paper (19-Jan-2026)
The correct answer is
$N_2$ & $O_2$

Atmosphere Dominant Gases

Earth's surface atmosphere is primarily composed of two major gases:

  • Nitrogen ($N_2$): Constitutes approximately 78% of the atmosphere.
  • Oxygen ($O_2$): Constitutes approximately 21% of the atmosphere.

Together, Nitrogen ($N_2$) and Oxygen ($O_2$) make up roughly 99% of the Earth's dry atmosphere, making them the dominant gases.

Therefore, the two gases that dominate Earth's surface atmosphere are Nitrogen ($N_2$) and Oxygen ($O_2$).

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