Three experiments are presented in this Science Study Aid to provide the teacher with some fundamental air pollution activities. The first experiment involved particulates, the second deals with microorganisms, and the third looks at gases in the atmosphere. Each activity outlines introductory information, objectives, materials required, procedure to follow, and discussion questions. Space is provided for completing charts and graphs and taking notes. This study aid is not intended to be a complete teaching unit, rather, a supplement to a regular program providing up-to-date, research related activities. (BL)