EPA IAQ Definitions

Allergen

Substance (such as dust mites, mold or mold spores) that can cause an allergic reaction

APR

Air purifying respirator

ASTM

American Society for Testing and Materials

Biocide

Substance or chemical that kills organisms such as molds

Building Occupants

Describes people who spend extended time periods in the building. Clients and visitors are also occupants; they may have different tolerances and expectations from those who spend their entire workdays in the building, and are likely to be more sensitive

Building Related Illness (BRI)

Refers to illness brought on by exposure to the building air, where symptoms of diagnosable illnesses are identified (e.g., certain allergies or infections) and can be directly attributed to environmental agents in the air. Legionnaire's disease and hyper

Dew Point

If the air is gradually cooled while maintaining the moisture content constant, the relative humidity will rise until it reaches 100%. This temperature, at which the moisture content in the air will saturate the air, is called the dew point. If the air is

Dry-Bulb Temperature

The temperature of the air measured with a dry thermocouple or thermometer with a dry bulb. The Dry-Bulb and Wet-Bulb temperatures can be used together to determine relative humidity.

EPA

Environmental Protection Agency

Fungi

Fungi are neither animals nor plants and are classified in a kingdom of their own. Fungi include molds, yeasts, mushrooms, and puffballs. In this document, the terms fungi and mold are used interchangeably. Molds reproduce by making spores. Mold spores wa

Fungicide

Substance or chemical that kills fungi

HEPA

High-Efficiency Particulate Air

Hypersensitivity

Great or excessive sensitivity

Humidity

The water vapor mixed with air in the atmosphere

Humidity Ratio

Also known as Specific Humidity, the pounds of water contained in a pound of dry air

IAQ

Indoor Air Quality

MERV

Minimum Efficiency Reporting Value

Mold

Molds are a group of organisms that belong to the kingdom Fungi. In this document, the terms fungi and mold are used interchangeably. There are over 20,000 species of mold.

mVOC

Microbial volatile organic compound, a chemical made by a mold that may have a moldy or musty odor

NIOSH

National Institute for Occupational Safety and Health

NFPA

National Fire Protection Association

OSHA

Occupational Safety and Health Administration

PAPR

Powered air purifying respirator

PPE

Personal Protective Equipment

Relative Humidity

The ratio of weight of water in the air relative to the maximum weight of water that can be held in saturated air

Remediate

Fix

Sensitization

Repeated or single exposure to an allergen that results in the exposed individual becoming hypersensitive to the allergen

Spore

Molds reproduce by means of spores. Spores are microscopic; they vary in shape and size (2-100 micrometers). Spores may travel in several ways-they may be passively moved (by a breeze or water drop), mechanically disturbed (by a person or animal passing b

Stack Effect

The pressure driven flow produced by convection (the tendency of warm air to rise)

UL

Underwriters Laboratories

Wet-Bulb Temperature

The temperature of the air measured with a wet thermocouple or thermometer with a wet bulb. The Dry-Bulb and Wet-Bulb temperatures can be used together to determine relative humidity.