The layer of the atmosphere that contains the highest level of oxygen is the troposphere. This is the lowest layer of the atmosphere, and it's where we live. The troposphere contains approximately 21% oxygen by volume.
The troposphere is where most of the Earth's weather occurs, and it's also where we find most of the air we breathe. Oxygen is essential for life on Earth, and the troposphere is the layer where most living things get the oxygen they need.
While the ozone layer, located in the stratosphere, is crucial for absorbing harmful ultraviolet radiation from the sun, it doesn't contain the highest concentration of oxygen. The ozone layer is primarily composed of ozone (O3), a molecule with three oxygen atoms.
