Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Theis the unit of measurement for total ozone.

Answer 1

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> The Dobson Unit is a way to describe how much ozone there would be in the column if it were all squeezed into a single layer.