| Maintenance (Cost) Valuation (environmental accounting) |
United Nations, Glossary of Environment Statistics |
| Malaria |
United Nations, Glossary of Environment Statistics |
| Manifest |
United States Environmental Protection Agency, Terms of Environment |
| Manifest System |
United States Environmental Protection Agency, Office of Compliance and Assurance |
| Manifest System |
United States Environmental Protection Agency, Terms of Environment |
| Margin of Safety |
United States Environmental Protection Agency, Terms of Environment |
| Marine Pollution |
United Nations, Glossary of Environment Statistics |
| Marsh |
United States Environmental Protection Agency, Terms of Environment |
| Marsh |
United Nations, Glossary of Environment Statistics |
| Material Safety Data Sheet (MSDS) |
United States Environmental Protection Agency, Office of Compliance and Assurance |
| Material Safety Data Sheet (MSDS) |
United States Environmental Protection Agency, Terms of Environment |
| Maximum Contaminant Level |
United States Environmental Protection Agency, Terms of Environment |
| Maximum Sustainable Yield |
United Nations, Glossary of Environment Statistics |
| Maximum Tolerated Dose |
United States Environmental Protection Agency, Terms of Environment |
| Medical Waste |
United States Environmental Protection Agency, Office of Compliance and Assurance |
| Medical Waste |
United States Environmental Protection Agency, Terms of Environment |
| Mercury |
United Nations, Glossary of Environment Statistics |
| Mercury (Hg) |
United States Environmental Protection Agency, Terms of Environment |
| Metabolites |
United States Environmental Protection Agency, Terms of Environment |
| Methane |
United States Environmental Protection Agency, Terms of Environment |
| Methane (CH4) |
United Nations, Glossary of Environment Statistics |
| Methanol |
United States Environmental Protection Agency, Terms of Environment |
| Methoxychlor |
United States Environmental Protection Agency, Terms of Environment |
| Microbiology |
United Nations, Glossary of Environment Statistics |
| Microenvironments |
United States Environmental Protection Agency, Terms of Environment |
| Microorganisms |
United States Environmental Protection Agency, Office of Compliance and Assurance |
| Milligrams/liter (mg/l) |
United States Environmental Protection Agency, Office of Compliance and Assurance |
| Mining Waste |
United States Environmental Protection Agency, Terms of Environment |
| Mining Wastes |
United Nations, Glossary of Environment Statistics |
| Mire |
United Nations, Glossary of Environment Statistics |
| Mist |
United States Environmental Protection Agency, Terms of Environment |
| Miticide |
United Nations, Glossary of Environment Statistics |
| Mitigation |
United States Environmental Protection Agency, Office of Compliance and Assurance |
| Mobile Source |
United States Environmental Protection Agency, Terms of Environment |
| Monitoring |
United States Environmental Protection Agency, Terms of Environment |
| Monitoring |
United Nations, Glossary of Environment Statistics |
| Monitoring Well |
United States Environmental Protection Agency, Office of Compliance and Assurance |
| Monitoring Well |
United States Environmental Protection Agency, Terms of Environment |
| Monitoring Well |
United Nations, Glossary of Environment Statistics |
| Monoclonal Antibodies (Also called MABs and MCAs) |
United States Environmental Protection Agency, Terms of Environment |
| Morbidity |
United States Environmental Protection Agency, Office of Compliance and Assurance |
| Morbidity |
United States Environmental Protection Agency, Terms of Environment |
| Mortality |
United States Environmental Protection Agency, Office of Compliance and Assurance |
| Mortality |
United States Environmental Protection Agency, Terms of Environment |
| Multiple Land Use |
United Nations, Glossary of Environment Statistics |
| Multiple Use |
United States Environmental Protection Agency, Terms of Environment |
| Municipal Sewage |
United States Environmental Protection Agency, Terms of Environment |
| Municipal Solid Waste |
United States Environmental Protection Agency, Terms of Environment |
| Municipal Wastes |
United Nations, Glossary of Environment Statistics |
| Mutagen |
United Nations, Glossary of Environment Statistics |
| Mutagen/Mutagenicity |
United States Environmental Protection Agency, Terms of Environment |
| Mutagenicity |
United States Environmental Protection Agency, Office of Compliance and Assurance |
| Mycology |
United Nations, Glossary of Environment Statistics |