short note on ozone depletion in the stratosphere?

Depletion of the ozene layer means that for a given vertical path fronm the earth's surface to the sun, less ozone is encountered along the way with each passing year.

Ozone is decreased by time, temperature, water vapor, molecules that are oxidized by ozone, and molecules that catalyze ozone destruction. Water vapor also serves to block the "nitrogen assistance" path of ozone formation.