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PA/SI Preliminary Assessment/Site Investigation
PAH Polynuclear Aromatic Hydrocarbons
PAGE
Polyacrylamide gel electrophoresis
PAM Performance Assessment Matrix
PAPR Powered Air-Purifying Respirator
Part A The overview portion of a TSDF HW permit application, under RCRA
Part B The detailed portion of a TSDF HW permit application, under RCRA
PBR Permit by Rule
PBT Portable Breathalyzer Test
PBT An additional meaning is "Persistent Bioaccumulative and Toxic" per US EPA
PCA Property Clearance Assessment
PCB Polychlorinated biphenyls (includes monochlorinated biphenyls, under US environmental regulations)
PCDF Polychlorinated Dibenzofurans
PCE Perchloroethylene
pCi/L pico Curies/Liter
PE Professional Engineer
PEA Preliminary Endangerment Assessment
PEL Permissible Exposure Limit, the maximum occupational exposure permitted under the OSHA regulations.
PETG Polyethylene Terephthalate G Copolyester
pH acidity/basicity   pH = -log[H] where [H] is hydrogen ion concentration.  A pH = 7 is neutral; pH > 10 is pretty alkaline; pH <3 is pretty acidic
PHA Preliminary Hazards Analysis
PHA Process Hazards Analysis - a general term describing the formal activity of reviewing, analyzing, and documenting the hazards likely to be associated with a particular industrial process. Often implies the use of a formal review method such as FTA, FMEA, HAZOP, etc.
PHS Particularly Hazardous Substance (as defined in 29 CFR 1910.1450)
PID Photo Ionization Detector
PIH Poison Inhalation Hazard
PL Public Law (Federal)
PM10 Particulate Matter less than 10 microns in diameter
PMN Pre-Manufacture Notification, required under TSCA.
POP Performance-Oriented Packaging
Potential
Having or showing the capacity to develop into something in the future.
POTW Publicly Owned Treatment Works (waste water treatment)
POV Privately Owned Vehicle
PPA Performance Partnership Agreement
ppb Parts per billion
PPE Personal Protective Equipment Includes goggles, gloves, shoes, coveralls, respirators, hard hats, etc.
ppm Parts of contaminant Per Million parts of air or other fluid. Usually called simply "parts per million" - a unit of measure of the concentration of one material mixed or dissolved into another. This unit may be converted to milligrams per cubic meter.
PRCS Permit Required Confined Space
PRP Potentially Responsible Party (Superfunds)
PSA Preliminary Site Assessment
PSB Public Safety Building
PSD Prevention of Significant Deterioration (CAA)
PSDI Presence Sensing Device Initiation
PSEL Plant Specific Emission Limit
psi Pounds per square inch
PSI Pollution Standards Index (Air)
psig Pounds per square inch gauge
PSM Process Safety Management
PVA Polyvinyl Alcohol
PVC Polyvinyl Chloride

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