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Wikipedia definition
1. Indoor air qualityIndoor air quality (IAQ) is a term which refers to the air quality within and around buildings and structures, especially as it relates to the health and comfort of building occupants. IAQ can be affected by gases, particulates, microbial contaminants or any mass or energy stressor that can induce adverse health conditions. Source control, filtration and the use of ventilation to dilute contaminants are the primary methods for improving indoor air quality in most buildings.
Read “Indoor air quality” on English Wikipedia
Read “空気質” on Japanese Wikipedia
Read “Indoor air quality” on DBpedia

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