| Acronym | Meaning |
| RLS | Recursive Least Squares (algorithm) |
| ELO | Epitaxial Lateral Overgrowth |
| CCAA | Canadian Clean Air Act |
| CAIRA | Chemical Accident/incident Response And Assistance |
| CAP | Cellulose Acetate Propionate |
| EHSO | Environmental Health And Safety Online |
| LDAR | Leak Detection And Repair |
| GPS | Generalized Phase Shift Formalism |
| UIC | Underground Injection Control |
| PSD | Passive Sampling Device(s) (for Air Pollution) |