Evaluation of Airborne Asbestos Concentrations Associated with the Operation and Maintenance of Brakes and Clutches on Nonautomated Heavy Equipment

Figure 4

Comparison of OSHA’s excursion limit (1 f/cc, dashed line) to personal breathing-zone chrysotile concentrations (PCME) for task-based samples with sampling durations of approximately 30 minutes or less (14–36 minutes). Averages (bars) and individual measurements (circles) are represented.