Included are 20 papers presented at the second AMA Congress on Environmental Health Problems. The papers have been grouped into these broad subject categories. One group relates to physical and chemical changes, living cells, mental health, and human physiology. The second category relates to tuberculosis, venereal disease, respiratory disease, and unexplained medical and disease symptoms and possible relationships to the environment. The third category relates to objectives, purposes, and needs, planning agencies, case histories, and medicine's role in urban areas. Other articles review medical ecology, the effectiveness of current immunization and education programs in disease control, environmental engineering, legislation and health, and risks versus cost. (PR)