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隔离区域进行了一项研究，以表征以下各项产生的气溶胶：(1) 在模拟轻型循环中运行的柴油动力运兵车和 ( 2）利用手工金属极电弧焊（MMAW）模拟修复现有设备。柴油动力车辆和 MMAW 工艺都会导致矿井空气中纳米和超细气溶胶的浓度增加。焊接过程还导致气溶胶的电迁移率和空气动力迁移率计数中值直径分别约为 140 纳米和 480 纳米。过滤器上收集的焊接颗粒含有碳、铁、锰、钙和铝。