What is the air composition of the mesosphere?

The mesosphere, which extends from about 50 to 85 kilometers above Earth's surface, has a composition similar to that of the lower atmosphere, primarily consisting of nitrogen (around 78%) and oxygen (about 21%). However, the density of air is much lower in the mesosphere, leading to a decreased concentration of these gases. Trace amounts of other gases, such as carbon dioxide and ozone, can also be found, but their proportions are minimal compared to nitrogen and oxygen. The temperatures in this layer decrease with altitude, further affecting the behavior of these gases.