Pollution |

Total Column Ozone in the Atmosphere

Total column ozone is the total amount of ozone in a column extending vertically from the earth's surface to the top of the atmosphere. It is measured using ground-based stations and satellites and is reported in Dobson units (DU). The ozone hole is defined in terms of reduced total column ozone—less than 220 DU. Stratospheric ozone is beneficial for humans and other life forms as it absorbs harmful ultraviolet (UV) radiation emitted by the sun and stops it from reaching...

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