Introduction: Accurate control of critical indoor environmental parameters is not only essential for the well-being and comfort of building occupants, but also has a major impact on energy efficiency. A multitude of parameters can affect indoor air quality (IAQ) from gases such as carbon dioxide, carbon monoxide and volatile organic compounds to particulates, humidity and bacteria such as legionella. Carbon dioxide is one of the greatest variables affecting indoor environmental quality since it is produced by people occupying the building. Carbon dioxide production is a function of the number, size and activity levels of the people present in the building. Local concentrations can therefore vary dramatically – for example when a meeting room is occupied, or while workers are on lunch or coffee breaks.
By Edinburgh Instruments Ltd based in Livingston, UNITED KINGDOM.
Stormwater run-off, process water, leachate, dredging, mining, agriculture, recycle water etc.
By Dungeness Environmental Solutions, Inc. (DESI) based in Everett, WASHINGTON (USA).
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