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Glossary of Mold Related Terms

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Maintenance

Care and upkeep of the surrounding environment.

Make-Up Air

Air brought into a building from outdoors through the ventilation system and that has not been previously circulated through the system.

Makeup Air

Outdoor air supplied to replace exhaust air and exfiltration.

Malaise

A vague feeling of discomfort or uneasiness.

Masking

The phenomenon where a quality in a mixture obscures one or more other qualities in it.

MCLs

Maximum Contaminant Levels

MCS

See "Multiple Chemical Sensitivity."

Mg/M3

Milligrams per cubic meter

Microbes

Microscopic organisms such as algae, insects, viruses, bacteria, fungi, and protozoa, some of which cause diseases.

Microbiologicals

See "Biological Contaminants."

Microenvironment

A particular part of the large environment that is in some way whole by itself. Used to describe a subset of the global environment such as the indoor environment.

Micron

A unit of linear measure equal to one millionth of a meter, or one thousandth of a millimeter.

Microorganism

A microscopic organism, especially a bacterium, fungus, or protozoan.

Mist

Liquid particles measuring between 40 and 500 microns. By contrast, particles making up fog are less than 40 microns.

Mitigation

Measures taken to reduce adverse effects on the environment.

Morbidity

The number of sick individuals or cases of disease in a population.

Mortality

The number of individual deaths in a population.

MSDS

Material Safety Data Sheet.

Multiple Chemical Sensitivity

A term used by some people to refer to a condition in which a person is considered to be sensitive to a number of chemicals at very low concentrations. There are a number of views about the existence, potential causes, and possible remedial actions regarding this phenomenon.

Mutagen

Any substance that can cause a change in genetic material.

Mutagenic

Able to cause a permanent change in the structure of DNA