Acronyms M - Q
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MCL: Maximum Contaminant Level
MCLG: Maximum Contaminant Level Goal
MDL: Method Detection Limit
MEI: Maximally (or most) Exposed Individual
MEP: Maximum Extent Practicable
MOE: Margin Of Exposure
MOS: Margin of Safety
MSDS: Material Safety Data Sheet

NAA: Nonattainment Area
NAAEC: North American Agreement on Environmental Cooperation
NAAQS: National Ambient Air Quality Standards
NACEPT: National Advisory Council for Environmental Policy and Technology
NAPS: National Air Pollution Surveillance
NCEPI: National Center for Environmental Publications and Information
NEPI: National Environmental Policy Institute
NEPPS: National Environmental Performance Partnership System
NIEHS: National Institute for Environmental Health Sciences
NFRAP: No Further Remedial Action Planned
NOAA: National Oceanographic and Atmospheric Administration
NOAC: Nature of Action Code
NOI: Notice of Intent
NOIC: Notice of Intent to Cancel
NOIS: Notice of Intent to Suspend
NOV: Notice of Violation
NPDES: National Pollutant Discharge Elimination System
NRD: Natural Resource Damage
NRDC: Natural Resources Defense Council
NSPS: New Source Performance Standards
NSR: New Source Review
NURP: National Urban Runoff Program

O3: Ozone
O&M: Operations and Maintenance
ORM: Other Regulated Material
OSHA: Occupational Safety and Health Administration
OSPR: Oil Spill Prevention and Response

P2: Pollution Prevention
PAT: Permit Assistance Team (RCRA)
PCA: Principle Component Analysis
PCN: Policy Criteria Notice
PCSD: Presidentís Council on Sustainable Development
PHSA: Public Health Service Act
PI: Preliminary Injunction. Program Information
PIP: Public Involvement Program
PIRG: Public Interest Research Group
PIT: Permit Improvement Team
PITS: Project Information Tracking System
PLIRRA: Pollution Liability Insurance and Risk Retention Act
PM: Particulate Matter
PM2.5: Particulate Matter Smaller than 2.5 Micrometers in Diameter
PM10: Particulate Matter (nominally 10m and less)
PM15:  Particulate Matter (nominally 15m and less)
PMR: Pollutant Mass Rate
PMRS: Performance Management and Recognition System
PMS: Program Management System
PO: Project Officer
POC: Point Of Compliance
POE: Point Of Exposure
POI: Point Of Interception
POLREP: Pollution Report
POP: Persistent Organic Pollutant
POR: Program of Requirements
POTW: Publicly Owned Treatment Works
PP: Program Planning
PPA:  Planned Program Accomplishment
PPB: Parts Per Billion
PPM/PPB:  Parts per million/parts per billion
PPT: Parts Per Trillion
PPTH: Parts Per Thousand
PQUA: Preliminary Quantitative Usage Analysis
PRA: Planned Regulatory Action
PRI: Periodic Reinvestigation
PRM: Prevention Reference Manuals
PRP: Potentially Responsible Party
PS: Point Source
PSAM: Point Source Ambient Monitoring
PSC: Program Site Coordinator
PSD: Prevention of Significant Deterioration
PSI: Pollutant Standards Index. Pounds Per Square Inch. Pressure Per Square Inch.
PSM: Point Source Monitoring
PV: Project Verification
QAC:
Quality Assurance Coordinator
QA/QC: Quality Assistance/Quality Control
QAMIS: Quality Assurance Management and Information System
QAO: Quality Assurance Officer
QAPP: Quality Assurance Program (or Project) Plan
QAT: Quality Action Team
QC: Quality Control
QCI: Quality Control Index
QNCR: Quarterly Noncompliance Report
QUA: Qualitative Use Assessment



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