Yes, the lowest layer of atmosphere is called the troposphere. The troposphere is the layer of the Earth's atmosphere closest to the surface, and contains the air that we breathe. It is the most dense layer of the atmosphere, and is where most of the weather occurs. The troposphere is bounded at the top by the tropopause, which is the boundary between the troposphere and the stratosphere. The troposphere is about 10 kilometres (6 miles) thick at the poles and about 18 kilometres (11 miles) thick at the equator.