Which layer of the atmosphere contains the ozone layer?

The ozone layer is located in the stratosphere, which is the second layer of the Earth's atmosphere, above the troposphere. This layer is crucial for life on Earth because it absorbs the majority of the Sun's harmful ultraviolet (UV) radiation, protecting living organisms from its damaging effects. The presence of ozone in this layer is essential for maintaining the balance of UV radiation that reaches the Earth’s surface.

In contrast, the troposphere is the layer closest to the Earth's surface and is where most weather events occur. The mesosphere is above the stratosphere and is characterized by decreasing temperatures with altitude, and it is where meteoroids typically burn up upon entering the atmosphere. The thermosphere, located above the mesosphere, contains very thin air and is where the auroras occur, along with the presence of the International Space Station. Therefore, the correct identification of the ozone layer within the stratosphere emphasizes its role in atmospheric protection against UV radiation.