Provides guidance on evaluating and resolving workplace chemical protective clothing and respirator issues in relation to NIOSH guidelines. Examines: Identification of the need for PPE; Selection of PPE using laboratory data; Field evaluation of the effectiveness of PPE; Effectiveness of decontamination procedures; Health effects of qualitative fit testing; Quantitative fit testing; Workplace protection factors; Employees training; and Evaluation of defective self contained breathing apparatus (SCBAs).