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August 23, 2010
Enviro 101: Environmental Abbreviations and Acronyms L-N

This list contains abbreviations and acronyms you may run across on this site or in some other EHS context.

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LADD: Lowest Acceptable Daily Dose

LAER: Lowest Achievable Emission Rate

LC: Lethal Concentration

LCL: Lower Control Limit

LCRS: Leachate Collection and Removal System

LDAR: Leak Detection and Repair Program

LD50: Low Dose Where Fifty Percent of Animals Die

LDCRS: Leachate Detection, Collection, and Removal System

LDIP: Laboratory Data Integrity Program

LDR: Land Disposal Restrictions (RCRA)

LDS: Leak Detection System

LEPC: Local Emergency Planning Committee

LERC: Local Emergency Response Committee

LEV: Low Emission Vehicle

LFL: Lower Flammability Limit

LNG: Liquefied Natural Gas

LOAEL: Lowest Observed Adverse Effect Level

LOE: Level of Effort

LOEL: Lowest Observed Effect Level

LPG: Liquefied Petroleum Gas

LQG: Large Quantity Generator

LST: Low Solvent Technology

LTD: Land Treatment Demonstration

LTU: Land Treatment Unit

LUST: Leaking Underground Storage Tank(s) (current usage omits the “L”)

µg/g: Micrograms per gram, one part per million (ppm)

µg/l: Micrograms per liter, one part per billion (ppb)

MACT: Maximum Achievable Control Technology

MCL: Maximum Contaminant Level

MDL: Method Detection Limit

MEK: Methyl Ethyl Ketone

MGD: Million Gallons Per Day

MIBK: Methyl Isobutyl Ketone

mips: Millions of Instructions per Second

MIS: Management Information System

MMT: Million Metric Tons

MOA: Memorandum of Agreement

MOI: Memorandum of Intent

MOU: Memorandum of Understanding

MP: Melting Point

MPRSA: Marine Protection, Research and Sanctuaries Act

MRL: Maximum-Residue Limit (Pesticide Tolerance)

MS: Mass Spectometry

MSA: Metropolitan Statistical Areas

MSDS: Material Safety Data Sheet

MSGP: Multi-Sector General Permit

MS4: Municipal Separate Storm Sewer Systems

MSL: Mean Sea Level

MSW: Municipal Solid Waste

MTBE: Methyl Tertiary Butyl Ether

MTD: Maximum Tolerated Dose

mw: Megawatt

MWC: Municipal Waste Combustor

NAA: Nonattainment Areas

NAAQS: National Ambient Air Quality Standards Program (CAA)

NAMS: National Air Monitoring System

NASA: National Aeronautics and Space Administration

NBS: National Bureau of Standards

NCP: National Contingency Plan

NCR: Noncompliance Report (CWA)

NDIR: Nondispersive Infrared Analysis

NEDS: National Emissions Data System

NELAC: National Environmental Laboratory Accreditation Conference

NELAP: National Environmental Laboratory Accreditation Program

NEPA: National Environmental Policy Act

NESHAPS: National Emissions Standards for Hazardous Air Pollutants (CAA)

NIOSH: National Institute for Occupational Safety & Health

NMFS: National Marine Fisheries Service

NMHC: Nonmethane Hydrocarbons

NMOC: Nonmethane Organic Compound

NOAA: National Oceanic and Atmospheric Administration

NOAEL: No Observed Adverse Effect Level

NOD: Notice of Deficiency (RCRA)

NOEL: No Observed Effects Level

NOHSCP: National Oil and Hazardous Substances Contingency Plan

NOV: Notice of Violation

NOX: Oxides of Nitrogen

NPDES: National Pollutant Discharge Elimination System (CWA)

NPL: National Priorities List (CERCLA)

NRC: National Response Center

NRCS: National Resource Conservation Service

NSDWR: National Secondary Drinking Water Regulations

NSPS: New Source Performance Standards (CAA)

NSR: New Source Review

NTP: National Toxicology Program

Abbreviations and Acronyms A and B
Abbreviations and Acronyms C and D
Abbreviations and Acronyms E through G
Abbreviations and Acronyms H through K
Abbreviations and Acronyms L through N
Abbreviations and Acronyms O through R
Abbreviations and Acronyms S and T
Abbreviations and Acronyms U through Z

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