The ozone layer is a region of the Earth’s atmosphere with a high concentration of ozone that blocks most of the sun’s harmful UV radiation. The ozone concentration is greatest at altitudes of between 20km and 40km above the surface of the Earth, where concentrations are between 2 and 8 parts per million. If all of the ozone in the ozone layer were compressed to atmospheric pressure at sea level, approximately how thick would it be?
