In this activity, students are encouraged to share what they know about ozone and explore misconceptions. Ideally, they will come to understand that ozone is desirable in the stratosphere and a serious pollutant in the troposphere. Students will be able to explain that ozone in the stratosphere is important for filtering out damaging ultraviolet radiation and that ozone in the troposphere is a pollutant as it can damage respiratory tissue in living organisms. The teacher’s guide contains detailed background material, learning goals, alignment to national standards, grade level/time, details on materials and preparation, procedure, assessment ideas, and modifications for alternative learners.