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Solids or liquids light enough to be suspended in air.


Disease-producing microorganisms or materials.


Permissible Exposure Limits (standards set by OSHA), workplace exposure limits established to protect on-the-job workers.


A term used to describe the hydrogen ion activity of a water system. A solution of pH 0 to 7 is acid, pH of 7 is neutral, pH 7 to 14 is alkaline.


An air compartment connected to a duct or ducts.


Preventive Maintenance


Recommendations defining responsibility and action.

Pollutant pathways

The routes followed by a pollutant from its emission (source) as it travels through a strucducts, air streams, etc.

Pons (+ cerebellum)

3rd division of the C.N.S.

Pontiac Fever

A flu-like illness caused by Legionnella or a similar bacterium named after a 1968 outbreak in Pontiac, Michigan.

Positive Pressure

Condition that exists when more air is supplied to a space than is exhausted, so that air pressure within that space is greater than that found in surrounding areas.

Psychosocial Factors

Psychological, organizational, and personal stressors that could produce symptoms similar to poor indoor air quality.

Public information

Development and dissemination of both technical and non-technical IAQ information to homeowners, private companies, the media, local officials, and other concerned parties.

Pulmonary Toxicants

Substances that affect the respiratory tract.

Purkinje Cells

A type of cell found in the cerebellar cortex.



Part of basal ganglia.