What is the total reach of Earth's atmosphere from the surface?

The total reach of Earth's atmosphere extends approximately 350 miles from the surface when considering various layers. While the majority of the atmosphere is concentrated in the troposphere, which extends up to about 10 miles, the atmosphere as a whole includes several layers above, such as the stratosphere, mesosphere, thermosphere, and exosphere, which collectively contribute to this total distance.

The thermosphere, for instance, can extend up to around 400 miles high, where the atmosphere gradually thins. The exosphere, which is the outermost layer, can extend even beyond this point, but it is often considered to be at the higher end of the atmospheric boundary. Therefore, taking into account both scientific measurements and common references for the extent of the atmosphere, 350 miles is indeed an appropriate figure to represent the total reach of Earth's atmosphere from the surface.