The abbreviations on this page were originally defined on the United States Environmental Protection Agency website.
M[]
MAC: Mobile Air Conditioner
MACT: Maximum Achievable Control Technology
MAPSIM: Mesoscale Air Pollution Simulation Model
MATC: Maximum Acceptable Toxic Concentration
MBAS: Methylene-Blue-Active Substances
MCL: Maximum Contaminant Level
MCLG: Maximum Contaminant Level Goal
MCS: Multiple Chemical Sensitivity
MDL: Method Detection Limit
MEC: Model Energy Code
MEI: Maximally (or most) Exposed Individual
MEP: Multiple Extraction Procedure
MHDDV: Medium Heavy-Duty Diesel Vehicle
MOBILE5A: Mobile Source Emission Factor Model
MOE: Margin Of Exposure
MOS: Margin of Safety
MP: Manufacturing-use Product; Melting Point
MPCA: Microbial Pest Control Agent
MPI: Maximum Permitted Intake
MPN: Maximum Possible Number
MPWC: Multiprocess Wet Cleaning
MRBMA: Mercury-Containing and Rechargeable Battery Management Act
MRF: Materials Recovery Facility
MRID: Master Record Identification number
MRL: Maximum-Residue Limit (Pesticide Tolerance)
MSW: Municipal Solid Waste
MTBE: Methyl tertiary butyl ether
MTD: Maximum Tolerated Dose
MUP: Manufacturing-Use Product
MUTA: Mutagenicity
MWC: Machine Wet Cleaning