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| Acronym | Acronym Meaning | Additional Information |
|---|---|---|
| MAC | Mobile Air Conditioner | |
| MACS | Media and Communication Services (IDEM) | |
| MACT | Maximum Achievable Control Technologies | |
| 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 | |
| MEK | Methyl Ethyl Keytone | |
| MEP | Multiple Extraction Procedure | |
| METS | Multimedia Enforcement Tracking System | |
| MFIS | Municipal Facility Information System | |
| MFL | Millions of Fibers per Liter | |
| mg/L | Milligrams Per Liter | |
| MHDDV | Medium Heavy-Duty Diesel Vehicle | |
| MM | Multimedia | |
| MMSOILS | Multimedia Contaminants Fate, Transport, and Exposure Model | |
| MNA | Monitored Natural Attenuation | |
| MOA | Memorandum of Agreement | |
| MOBILE5A | Mobile Source Emission Factor Model | |
| MOE | Margin Of Exposure | |
| MOS | Margin of Safety | |
| MOS | Measure of Success | |
| MOU | Memorandum of Understanding | |
| MP | Melting Point | |
| MP | Manufacturing-use Product | |
| MPCA | Microbial Pest Control Agent | |
| MPE | Multi Phase Extraction | |
| MPI | Maximum Permitted Intake | |
| MPN | Maximum Possible Number | |
| MPWC | Multiprocess Wet Cleaning | |
| MRDL | Maximum Residual Disinfectant Level | |
| MRDLG | Maximum Residual Disinfectant Level Goal | |
| MRF | Materials Recovery Facility | |
| MRID | Master Record Identification number | |
| MRL | Maximum-Residue Limit (Pesticide Tolerance) | |
| MS/MSD | Matrix Spike/Matrix Spike Duplicate | |
| MSCA | Multi-Site Cooperative Agreement | |
| MSDS | Material Safety Data Sheet | |
| MSL | Mean Sea Level | |
| MSOP | Minor Source Operating Permit | |
| MSOP | Minor State Operating Permit | |
| MSRAS | Midwest States Risk Assessment Symposium | |
| MSW | Municipal Solid Waste | |
| MSWLF | Municipal Solid Waste Landfill Facility | |
| MTBE | Methyltertiary butyl ether | |
| MTD | Maximum Tolerated Dose | |
| MTP | Maximum Total Trihalomethane Potential | |
| MUP | Manufacturing-Use Product | |
| MUTA | Mutagenicity | |
| MVAC | Motor Vehicle Air Conditioning | |
| MW | Monitoring Well | |
| MWC | Machine Wet Cleaning | |
| MWWTP | Municipal Waste-Water Treatment Plant |
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