Indoor air quality can frequently be significantly worse than outdoor air quality, sometimes by a factor of two to five times, according to environmental health assessments. This counterintuitive reality occurs because modern residential and commercial buildings are tightly constructed and heavily insulated for energy conservation, which effectively traps generated pollutants indoors with little natural escape. Everyday household items—such as synthetic building materials, chemical cleaning supplies, cooking fumes, pressed-wood furniture, and personal care aerosols—continuously release volatile organic compounds and particulate matter into closed spaces. Without robust mechanical ventilation and high-efficiency filtration, these indoor contaminants accumulate to concentrations that far exceed typical outdoor pollution levels.
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