The main gas found in the Earth's stratosphere is ozone (O3). This layer of the atmosphere, located between about 10 and 50 kilometers (6 to 31 miles) above the Earth's surface, contains a significant concentration of ozone. Ozone plays a crucial role in absorbing the majority of the sun's harmful ultraviolet (UV) radiation, which protects living organisms on Earth. The ozone layer is essential for maintaining ecological balance and human health. It is located primarily in the stratosphere, forming a protective shield that helps to regulate temperature and climate at the Earth's surface.