One of three in a series about pollution, this teacher's guide for a unit on air pollution is designed for use in junior high school grades. It offers suggestions for extending the information and activities contained in the textual material for students. Chapter 1 discusses the problem of air pollution and involves students in processes of observing, gathering data, analyzing, and hypothesizing. Chapter 2 gives up-to-date information pertaining to the problems and considers pollution disasters, conditions necessary for air pollution to develop, natural and man-made air pollution, the effects of air pollution, economic costs, and control and possible solutions to air pollution. Chapter 3 contains 25 student investigations - experiments, demonstrations, projects - designed to illustrate the physical properties of air, effects of air movement, chemical changes in air, and pollution accumulation and gives practice in observing, predicting, and hypothesizing as well as controlling experiments. A conceptual schemata for the experiments is included. Utilizing a question format, the last chapter outlines a series of discussions, activities, and projects concerning air pollution suited to individual, small group, and large group work. Numerous illustrations supplement the text. Related documents are SE 012 759 and SE 012 760. (BL)