1. How is ozone measured in the atmosphere? What instrument is used to measure ozone? What are the units of measurement? How long have we been monitoring ozone levels in the stratosphere?

2. We have naturally occuring ozone in the stratosphere. True or False? If true, how does it occur? Do we have naturally occuring ozone in the troposphere?

3. What are CFC's? What are the effects of incread CFC's on stratospheric ozone? Do we want high or low levels of ozone in the stratosphere? In the troposphere?

4. What will happen in the troposphere if we decrease the amount of ozone in the stratosphere? How is ozone related to Climate Change?