Explain the importance of ozone in the atmosphere. Describe the existence of the hole in the ozone layer. Determine ways to prevent air pollution. Lesson Full group 1. Tell students that a very important gas in the atmosphere is ozone.
Ozone is a pale blue gas.
It is toxic and explosive. It occurs naturally in small amounts close to the earth, but is found in higher concentrations in the upper atmosphere. Ask students if anyone has ever heard of the ozone layer. Allow students to present the idea to their classmates. The layer is therefore about 24 miles thick.