Explain why stratospheric ozone protection has been considered an environmental success story

Ozone gas in stratosphere is considered as an environmental success because of its protective role.

Explanation:

Ozone is both hazardous and beneficial gas depending on where it is found. On ground or troposphere it has harmful impact on the health of living organisms and can trigger asthma. On the other hand, Stratospheric ozone protects us from harmful UV radiations that are coming from the Sun. It acts as a sheath around Earth which reflects the unwanted UV radiations back in space, which otherwise would cause various diseases and skin cancer. Ozone hole is the depleted region above in the atmosphere where Ozone has vanished due to several human activities. One of those regions lie above the Antarctic.