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| PHA | preliminary hazard assessment |
| PPE | personal protective equipment |
| PM | preventive maintenance |
| PtD | prevention through design |
| R&D | research and development |
| REL | recommended exposure limit |
| SMACNA | Sheet Metal and Air Conditioning Contractors’ National Association |
| SMPS | scanning mobility particle sizer |
| SOP | standard operating procedures |
| TEM | transmission electron microscopy |
| TEOM | tapered element oscillating microbalance |
| TLV® | threshold limit value |
| TWA | time-weighted average |
| VAV | variable air volume |
| VEM | video exposure monitoring |
| wg | water gauge |
| µg | microgram |
| µm | micrometer |
Current Strategies for Engineering Controls in Nanomaterial Production and Downstream Handling Processes
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