| Acronym | Meaning |
 | ACL | Alternative Concentration Limit |
| ITTFA | Iterative Target Transformation Factor Analysis |
| PSD | Photon Stimulated Desorption |
| NCTN | NASA Commercial Technology Network |
| AQMD | Air Quality Management District |
| PAS | Photoacoustic Spectroscopy |
| TDPAC | Time Differential Perturbed Angular Correlation |
| SDS | Simulated Distribution System [for Water] |
| PSLC | Polymer-stabilized Liquid Crystal |
| RBC | Rotating Biological Contactor |
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