The standard for indoor air quality is defined by a comprehensive framework of guidelines, benchmark concentration limits, and protocols established by international and national organizations such as the World Health Organization, the Environmental Protection Agency, and the International Organization for Standardization. These standards outline safe exposure thresholds for specific pollutants, including keeping fine particulate matter (PM2.5) below 12 micrograms per cubic meter, carbon dioxide under 1,000 parts per million, and relative humidity strictly between 30 and 50 percent. Adhering to these established standards helps building engineers, environmental hygienists, and homeowners maintain healthy, breathable, and safe indoor environments across residential and commercial properties.
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