Researchers from the National Institute for Occupational Safety and Health (NIOSH) conducted a study in an isolated zone of an underground mine to characterize aerosols generated by: (1) a diesel-powered personnel carrier vehicle operated over a simulated light-duty cycle and (2) the simulated repair of existing equipment using manual metal arc welding (MMAW). Both the diesel-powered vehicle and MMAW process contributed to concentrations of nano and ultrafine aerosols in the mine air. The welding process also contributed to aerosols with electrical mobility and aerodynamic mobility count median diameters of approximately 140 and 480 nm, respectively. The welding particles collected on the filters contained carbon, iron, manganese, calcium, and aluminum.

美国国家职业安全与健康研究所（NIOSH）的研究人员在地下矿井的一个偏僻地区进行了一项研究，以表征以下情况产生的气溶胶：（1）在模拟轻载周期内运行的柴油动力人员运载工具，以及（ 2）使用手动金属电弧焊（MMAW）对现有设备进行模拟维修。柴油动力车辆和MMAW工艺都有助于矿井空气中纳米和超细气溶胶的浓度。焊接工艺还有助于产生具有电迁移率和空气动力学迁移率计数中值直径分别约为140和480 nm的气溶胶。收集在过滤器上的焊接颗粒包含碳，铁，锰，钙和铝。