Comparative evaluation of Indoor and outdoor air quality ‐ chemical considerations

Abstract
The sources and major environmental pathways of important primary and secondary air pollutants are reviewed, and typical concentrations in background, polluted outdoor, and indoor air defined. Indoor/outdoor concentration relationships indicate that pollutant levels indoors are normally lower than those outdoors due to enhanced deposition processes in the indoor environment. The converse is found where a major source of pollutants is present indoors, and in some instances extremely elevated pollutant levels have been observed.

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