| Acronym | Meaning |
| RAPS | Regional Air Pollution Study |
| KKT | Kramers-Kronig Transformation |
| OPPE | Office Of Policy |
| DAS | Double Antibody Sandwich |
| CBI | Compliance Biomonitoring Inspection |
| MICE | Methods Information Communications Exchange |
| QRPA | Quadratic Random Phase Approxn. |
| CCFO | Charge-charge Flux Overlap (model In Mol.-property Calcns.) |
| G2 | Gaussian-two (an Ab Initio Mo Theory For Mol. Energies Calcn.) |
| ICM | Intracluster Medium |