How can you monitor and improve indoor air quality (IAQ) in campus buildings?

• A. CO2 levels are irrelevant to IAQ.
• B. Regular filter changes only.
• C. Regular filter changes, ensure adequate ventilation rates, CO2 monitoring, and minimize pollutant sources.
• D. Use perfumed air fresheners.

Answer: (C)

Improving IAQ comes from four integrated practices: keep air moving with adequate ventilation, maintain filtration so particulates are removed, use CO2 as a real‑time signal of whether ventilation is meeting occupants’ needs, and minimize pollutant sources. Regular filter changes keep the HVAC system able to remove particles effectively. But filters alone don’t bring in fresh air or dilute contaminants, so ensuring ventilation rates meet evidence-based standards is essential. Monitoring CO2 provides a practical cue: if levels rise as occupancy grows, it suggests ventilation isn’t keeping up and adjustments are needed. At the same time, reducing pollutant sources—selecting low-emitting materials, choosing safer cleaning products, and avoiding perfumed air fresheners—lowers the amount of contaminants that can accumulate. Together, these steps address ventilation, filtration, and source control, giving a comprehensive approach to healthier indoor air.