This module, one of 25 on vocational education training for careers in environmental health occupations, contains self-instructional materials on collecting samples of workplace air. Following guidelines for students and instructors and an introduction that explains what the student will learn are three lessons: (1) collecting information about sampling conditions and about the individual being sampled; (2) positioning an air sampling train on an individual so that a representative sample can be obtained while allowing the worker freedom of movement; and (3) adjusting the pump flow over the sampling period and determining if and when a new sampling device may be needed. Each lesson contains objectives, recommended methods and locations for practice, performance criteria, equipment and supplies to perform a task, detailed step-by-step instructions for learning a task, and performance exercises. Performance tests cover the subject matter of each lesson. (CT)