O

O2

oxygen

O3

ozone

Ox

total oxidants

OA

opportunity assessment (for pollution prevention)

OAP

Office of Atmospheric Programs (OAR-EPA)

OAQ

Office of Air Quality (EPA)

OAQPS

Office of Air Quality Planning and Standards (OAR-EPA)

OAR

Office of Air and Radiation (EPA)

OBD

onboard diagnostic

OB/OD

open burning/open detonation

OC

open cup

OCAP

operating criteria and procedures

OCD

offshore and coastal dispersion model

OD

outside diameter

ODB

outdoor burning

ODC

ozone (layer) depleting chemicals

ODP

ozone depletion potential

ODTS

organic dust toxic syndrome

OE

Office of Enforcement (EPA)

OFA

overfire air (staged combustion)

OFM

organic feed material

O&G

oil and gas

O&M

operations and maintenance

OMP

operation, monitoring, & performance

OPPE

Office of Policy, Planning, and Evaluation (EPA)

orl

oral

ORP

oxidation-reduction potential

OTR

ozone transport region

OVES

opacity and visible emission standards

P

PCS

program control system

PDFID

positive direct flame ionization detection

PDR

particulate data reduction

PDS

preliminary determination summary

PE

performance evaluation

PEF

particulate emission factor m3/Kg

PEMS

predictive emissions monitoring system

PEPE

prolonged elevated pollution episode

PFD

proposal for decision

pg

picogram (one trillionth of a gram)

PHSA

Public Health Service Act

PI

preliminary injunction

PI

program information

PIC

prior informed consent

PIC

product of incomplete combustion

PIRG

Public Interest Research Group

Pk

peak concentration

PLUVUE

plume visibility model

PM

particulate matter

PM 2 . 5

very fine particulate matter

PM10

particulate matter less than ten microns in diameter

PM15

particulate matter less than 15 microns in diameter

PMI

preventive maintenance instructions

PMR

pollutant mass rate

PN

public notification

POC

point of compliance

POD

point of determination

POL

petroleum, oils, and lubricants

POLREP

pollution report

PPA

Pollution Prevention Act (42 USC §§ 13101 - 13109)

ppb

parts per billion

ppbv

parts per billion by volume

PPE

personal protective equipment

ppm

parts per million

ppm/ppb

parts per million/ parts per billion

ppmv

parts per million by volume

ppmvd

parts per million by volume, dry

PPP

pollution prevention plan

ppq

parts per quadrillion

PPSP

power plant siting program

ppt

parts per trillion

PPTH

parts per thousand

PR

preliminary review

PRA

planned regulatory action

PRI

periodic reinvestigation

PRNIC

public and regulatory notification of intent to comply

PS

point source

PS

primary standard

PSAM

point source ambient monitoring

PSD

prevention of significant deterioration (air)

PSES

Pretreatment Standards for Existing Sources

PSI

Pollutant Standards Index

PSI

pounds per square inch

PSIA

pounds per square inch, absolute

PSIG

pounds per square inch, gauge

PSM

point source monitoring

PSNS

Pretreatment Standards for New Sources

PSU

Primary Sampling Unit

PTE

potential to emit

PTFE

polytetrafluoroethylene (such as Teflon)

PTO

permit to operate

PTPLU

point source Gaussian diffusion model

PTS

permeation tube system

PUC

Public Utility Commission

P/V

pressure/vacuum

PV

project verification

PVA

polyvinyl alcohol

PVC

polyvinyl chloride (code 3 plastic)

PVQ

previsit questionnaire

Q

Qad

allowable dilution flow

QA

quality assurance

QAARP

quality assurance annual report and work plan

QAC

quality assurance coordinator

QAM

quality assurance manager

QAMIS

quality assurance management and information system

QAO

quality assurance officer

QA/QC

quality assurance/quality control

QAT

quality action team

QBtu

quadrillion British thermal units

QC

quality control

QCI

quality control index

QIP

quality improvement plan

QLF/ACE

Quebec-Labrador Foundation/Atlantic Center for the Environment

QMP

quality management plan

QMS

quality management system

QNCR

quarterly noncompliance report

QUA

qualitative use assessment