The National Institute for Occupational Safety and Health recently completed industrial hygiene surveys in three PCB disposal facilities. Contamination levels of PCBs (surface and airborne) and PCDDs/PCDFs (surface) were characterized during normal operations. Ninety-five out of ninety-six air samples collected for PCBs exceeded the NIOSH Recommended Exposure Limit of 1.0 μg/m 3. Seventy-four percent ( 86 117 ) of the PCB surface samples were above our contamination guideline of 100 μg/m 2. Twelve surface samples were collected for the determination of the tetra- through octa-chlorinated PCDD and PCDF homologs and the 2,3,7,8-substituted isomers. Eleven (92%) of the samples were above our contamination guideline of 1.0 ng/m 2 (2,3,7,8-TCDD equivalents). The 2,3,7,8-TCDD isomer was found in one facility.