This is one of a series of units for environmental education developed by the Highline Public Schools. The lessons in this unit are designed to help students discover causes, effects, and results of air pollution through involvement in various activities; it is recommended for intermediate grade elementary school pupils. The unit can be used independently, but it is recommended for use with or following the unit entitled "It's All in the Air." The materials were tried and evaluated; evaluation data may be obtained from the Highline Public Schools. (RH)