![]() Additionally, this research identified the possible factors which could contribute to breathing zone concentration variations. This research revealed that the chest sampler provides a consistent relationship to the concentrations measured at the nose for a given job category. In the vast majority of cases, the heights of employees and visitors will vary, and employers must construct their barriers to at least address average heights. Height: Employers must take into account the height of employees and other individuals, as it impacts where their breathing zones are located. ![]() Styrene air concentrations detected at the nose were significantly different than those concentrations detected at the other three locations and represented 90 percent, 84 percent, and 76 percent of the left lapel, right lapel, and chest samplers, respectively. If the breathing zone of the worker and the contaminant source are within this wake region, high exposures may occur. OSHA defines the breathing zone as the area from which a person draws air when they breathe it extends 10 inches beyond a person’s nose and mouth in all directions. Two job classes were studied: the spray gun operators and the rolling and tucking operators. Ambient Ambient The Donaldson Ambient Collection System is a self-contained, ceiling-mounted dust collector system that utilizes Ultra-Web® cartridge filter technology. An extensive field investigation in a boat manufacturing plant was conducted where styrene air concentrations were measured by mounting four 3M one-stage diffusion samplers around the worker's breathing zone. The Donaldson Torit® Downflo® Oval (DFO) cartridge dust collector is a compact, high-efficiency unit that use oval-shaped filters suited for filtering submicron dust. It has been generally assumed that vapor is uniformly mixed in the breathing zone therefore, samplers are placed on either lapel or on the chest of the worker. This study reports on personal breathing zone (PBZ) and area measurements for DPM (expressed as elemental carbon) during oil and gas extraction operations including drilling, completions (which includes hydraulic fracturing), and servicing work. This zone is considered to have an airborne chemical concentration equivalent to the concentration breathed by the worker. ![]() (definition varies, but OSHA uses a 50 cut point of 4 microns. compared to the OSHA Action Level, and OSHA PEL. Breathing zone samples are used to estimate worker exposure to airborne contaminants by collecting air from a vaguely defined zone surrounding the head. on a filter (either personal breathing zone or area) and sent to a laboratory. workers at breathing zone height (about 5 feet above the floor).
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