Environmental Protection Agency (EPA) MVAC Certification

Where in the atmosphere is the ozone layer primarily located?

1. Troposphere

2. Mesosphere

3. Stratosphere

4. Exosphere

The correct answer is: Stratosphere

The ozone layer is primarily located in the stratosphere, which is the second atmospheric layer above the Earth's surface. This layer is crucial because it contains a high concentration of ozone (O3) molecules that absorb the majority of the sun's harmful ultraviolet (UV) radiation. By filtering these rays, the ozone layer plays a vital role in protecting living organisms on Earth from potential damage, such as skin cancer and other health issues. The stratosphere's stability and temperature profile, where temperature increases with altitude, allow the ozone molecules to accumulate and persist, thereby forming this essential layer. Understanding the location and function of the ozone layer is fundamental when discussing atmospheric science, environmental protection, and the impact of human activities on this natural shield.