A nuclide that degenerates with the emission of electromagnetic radiation. See Nuclide.

Smallest dose of ultraviolet radiation which causes a barely perceptible reddening of the skin. Depended on the skin color of an individual.

A single molecule that may bind chemically with like others to create a ring or chain termed a polymer.

The rate of incidence of a disease.

Nerve cells which transmit signals from the CNS to muscles and glands.

Viral disease causing painful swelling of the glands in the mouth that produces saliva. The disease is generally self-limited, running its course before receding, with no specific treatment apart from controlling the symptoms with pain medication.

Toxins produced by some species of mold, the toxins are very dangerous to humans and animals.

Nearsightedness or shortsightedness, caused by light being focused in front of the retina rather than on it.

A material having particles or constituents of nanoscale dimensions.

A personal dedicated resting space optimized to offer a short but regenerative sleep.

The National Ambient Air Quality Standards (NAAQS) are concentration limits set by the EPA for six pollutants known as criteria air pollutants; The NAAQS's primary standards set limits that protect public health, including sensitive populations, while the secondary standard limits are set to protect public welfare, such as visibility impairment and damage crops.

Non-enforced limits of select drinking water contaminants. Mainly target minerals which affect water taste and enter the water through natural deposits.

ANSI/ASHRAE Standards 62.1 is the recognized standard for ventilation system design and acceptable procedure with regards to establishing an effective ventilation system.

Daily ingestion level of at substance believed to have no harmful effect to all people, including susceptible populations. Typically between 10 times less and the same as the Reference Dose.

Diseases of the brain and nervous system.

A specialized cell of the nervous system that transmits electrochemical signals.

A poison that targets the nervous system, disrupting proper neuron-signalling.

Sound waves are pressure variations in a medium (air, water, etc.). The pressure differences create vibrations and are ultimately interpreted as sounds/noises when they reach the ears.

Most commonly detected nitrosamine in water supplies. Likely carcinogenic and formed as a result of reactions with chloramine.

Noise cancellation is the methodology for cancelling sound through either active or passive means. Active noise cancelling uses signal processors to invert incoming signals and generate inverse waves for destructive interference. Passive noise cancelling utilizes insulation and sound-absorbing materials to reduce sound.

The energy and particles which are released during the decomposition process of atomic nuclei is called radiation.

A sheet, spray- or trowel-applied membrane or material layer that prevents the passage of liquid water even after long or continuous exposure to moisture.

In terms of air pollution, regions are noncompliant if they fail to achieve standards set by NAAQS.

A standard by which water filters are judged.

Synaptic pathways convey information to the central nervous system. In the auditory system, afferent synapses, transmit signals from the auditory hair cells to the brain.

Outlines current indoor air quality guidelines for the workplace.

The organ of Corti contains the auditory hair cells that respond to the perilymph vibrations and transmit them into electrochemical impulses for the auditory nerve.

Member of a large class of gaseous, liquid or solid chemical compounds whose molecules contain carbon and hydrogen.

Commonly used as anti-fouling agents, an organic compound with one or more tin atoms in its molecules.

A pathway in cellular metabolism that re-creates the energy dense molecule adenosine triphosphate.

Oxidative rancidity occurs during a free radical process where the double bonds of an unsaturated fat are cleaved in the presence of oxygen, relasing volatile aldehydes and ketones.

A chemical element required only in small or minute amounts by living organisms for normal growth and function.

A solid thermoplastic form of liquid formaldehyde.

Part of the autonomic nervous system which prepares the body for activities in the absence of stress, such as rest and digestion.

Designing objects and spaces with aesthetically pleasing while maximizing accessibility, usability and operability regardless of the user's age, ability and other factors.

Conducted to determine safety by ascertaining how damaging a given chemical may be to living or non-living organisms.

Heat transfer resulting from Planck radiation and an imbalance in temperatures between an object and its surroundings. The only mode of heat transfer which can operate in a vacuum.

A flame retardant also denoted PentaBDE. Most commonly used as a in flexible polyurethane foam and printed circuit boards.

A sterilization method that uses ultraviolet (UV) light to break down microorganisms by destroying their DNA. Often used in a variety of applications, such as food, air and water purification.

The duration of one cycle in a wave or wavelength. The reciprocal of frequency

A collection of compounds that have high resistance to degradation from abiotic and biotic factors, high mobility in the environment and high toxicity.

The pesticide that may remain on or in food after they are applied.

Petroleum-based synthesized fertilizers were one of the major breakthroughs of the industrial and green revolutions. Today nearly half of all crop yields are directly attributable to synthetic commercial fertilizer. Although these fertilizers can boost yields, over time they lead to lower nutrient content in food, decreased soil biodiversity and are a major source of environmental pollution.

Transformation of matter from one state to another (e.g. melting from solid to liquid or condensing from vapor to liquid). Tremendous change in energy despite no change in temperature.

Achieved when you combine UV light rays with a TiO2-coated filter.

A salt or ester of phthalic acid, most commonly used as plasticizers in PVC.

The eye's response to brightness using a the rods in dim light. Most sensitive to light at 498 nm.

Pollution generated by a single location, such as a power plant or factory.

Part of the autonomic nervous system which prepares the body for high energy activity in response to stress.