What is the altitude of the troposphere layer?

The troposphere is the lowest layer of Earth's atmosphere, extending from the surface up to an altitude of about 8 to 15 kilometers (5 to 9 miles). Its height varies depending on geographic location, with the troposphere being thicker at the equator and thinner at the poles. This layer contains most of the atmosphere's mass and is where weather phenomena occur. The boundary between the troposphere and the stratosphere is known as the tropopause.