TEXTBOOK USED FRO THIS CLASS IS UNDERSTANDING ENVIRONMENTAL HEALTH, HOW WE LIVE IN THE WORLD, BY NANCY MAXWELL THE SECOND EDITION. READ CHAPTER 4 AND 7.Discuss the main causes of ambient air pollution and the influence that urbanization has on ambient air quality and health. What actions can be taken to reduce air pollution emissions? Consider possibilities at the individual, community, national, and international levels. How can air quality be monitored and improved as a global initiative?