| Acronym | Meaning |
 | PPM | Pair Population Method |
| SAACGS | State Ambient Air Concentration Guidelines Or Standards |
| PARS | Photoacoustic Raman Spectroscopy |
| NIRMS | Noble Gas-ion Reflection Mass Spectrometry |
| PAGIF | Polyacrylamide Gel Isoelectric Focusing |
| INS | Inelastic Neutron Scattering |
| WSDA | Weighted Spin-density Approxn. |
| CMSM | Carbon Molecular Sieve Membrane |
| PSRG | Position-space Renormalization Group (for D.-of-states Calcns.) |
| WAMMAS | Waste Minimization Management Advisory System |
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