Arrange the following greenhouse gases in decreasing order of their concentration (by volume) in the Earth’s atmosphere up to an altitude of 100 km.
(A) Ozone (B) Carbon dioxide (C) Methane (D) Nitrous oxide
Choose the correct answer from the options given below:

Correct option is C

Explanation:
Greenhouse gases are present in the atmosphere in varying concentrations. When ranked by volume, the correct decreasing order is:
Carbon dioxide (CO₂) > Methane (CH₄) > Nitrous oxide (N₂O) > Ozone (O₃)
· CO₂ is the most abundant long-lived anthropogenic greenhouse gas.
· CH₄ has a lower concentration than CO₂ but is more potent per molecule.
· N₂O is even lower in volume than CH₄.
· O₃ is present in much smaller quantities and is mostly concentrated in the stratosphere.
Information Booster:
Typical concentrations of greenhouse gases in the atmosphere:
· CO₂: ~420 ppm (parts per million)
· CH₄: ~1.9 ppm
· N₂O: ~0.33 ppm
· O₃: ~0.07 ppm (varies with altitude and region)
Even though Ozone plays a significant role in absorbing ultraviolet radiation, its volume concentration is much lower than the other gases listed here.