| APC | AVL Particle Counter |
| EEPS | Engine Exhaust Particle Sizer |
| SPN | Solid Particle Number |
| PN | Particle Number |
| THC | Total Hydro-carbons |
| WHSC | World-Harmonized Stationary Cycle |
| CPC | Condensation Particle Counters |
| HEPA | High-Efficiency Particulate Air Filter |
| GTR | Global Technical Regulation |
| NOxp | Calculated NOx Concentration |
| SPN10 | Calculated 10 nm Particle Concentration |
| SPN23 | Calculated 23 nm Particle Concentration |
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