the ozone layer of how many miles from the earth's surface
the troposphere, the region closest to Earth (from the surface to about 10â16 kilometers (6â10 miles)). The remaining ozone (about 90%) resides in the stratosphere between the top of the troposphere and about 50 kilometers (31 miles) altitude. The large amount of ozone in the stratosphere is often referred to as the âozone layer.â