Air Contaminant: Any particulate matter, gas, or combination thereof, other than water vapor. (See: air pollutant.) ...
Toxic Air Contaminant (TAC): An air pollutant, identified in regulation by the ARB, which may cause or contribute to an increase in deaths or in serious illness, or which may pose a present or potential hazard to human health.
Air contaminants present inside homes and buildings. Many think that air pollution is only a problem outdoors, however, indoor air pollution is actually responsible for many human health problems.
A unit of concentration for air contaminants. A mercury vapor level of 1.0 mg/m3 means that one milligram (one thousandth of a gram) of mercury vapor was detected in each cubic meter of sampled air.
Milligram per kilogram (mg/kg) ...
Z-list OSHA's tables of toxic and hazardous air contaminants.
zonation The distinct, conspicuous layers (or belts) found in soils, vegetation, bodies of water, and on mountains.
Environmental Factors: Conditions other than indoor air contaminants that cause stress, comfort, and/or health problems (e.g., humidity extremes, drafts, lack of air circulation, noise, and over-crowding).
Air-Purifying Respirator: A respirator with an air-purifying filter, cartridge or canister that removes specific air contaminants by passing ambient air through the air-purifying element.
 See also: Table, Water, Toxic, Contaminant, Soil
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