Ozone levels can be described in several ways. One of the most common measures is how much ozone is in a vertical column of air. The [[Dobson unit]] is a measure of column ozone. Other measures include partial pressure, number density, and concentration of ozone, and can represent either column ozone or the amount of ozone at a particular altitude. | Ozone levels can be described in several ways. One of the most common measures is how much ozone is in a vertical column of air. The [[Dobson unit]] is a measure of column ozone. Other measures include partial pressure, number density, and concentration of ozone, and can represent either column ozone or the amount of ozone at a particular altitude. |