Consider the following questions:
Question 1. Explain the difference between tropospheric and stratospheric ozone. What causes stratospheric ozone depletion? Has the Montreal Protocol been successful in solving the problem?
Question 2. What is particulate matter, and what are its sources? Describe the health effects of particulate matter and the efforts used to regulate it. What more do you think should be done to control this type of air pollution?
Reference:
Study guide: The Physics of the Atmosphere and the Science of Air Pollution.