Source control eliminates or reduces indoor air pollutants at their point of generation through material selection, operational practices, and equipment design. This preventive strategy proves more cost-effective and health-protective than relying on dilution ventilation alone. Source control includes selecting low-emission materials, maintaining equipment properly, and removing or isolating contamination sources.
Implementation Strategies
Source control encompasses selecting low-VOC paints and adhesives, installing high-efficiency filters to prevent equipment-generated particulates, using sealed combustion for gas appliances, and eliminating moisture sources that promote mold growth. Material selection during construction significantly impacts indoor air quality for years. Low-emission products carry certifications like FloorScore, Greenguard, or cradle-to-cradle designations. Operational source control includes proper humidity maintenance (30 to 50 percent relative humidity), regular equipment cleaning, and pest management without chemical pesticides.
Benefits and Cost-Effectiveness
Source control reduces required ventilation rates, lowering energy costs and mechanical equipment sizes. Indoor air quality improves more substantially than through ventilation alone. Eliminating formaldehyde, VOCs, and other toxins at generation points prevents occupant health issues including sick building syndrome. Buildings implementing comprehensive source control require 20 to 30 percent less outdoor air ventilation while maintaining superior air quality compared to dilution-only approaches. This strategy supports WELL Building Standard and LEED certification objectives.