Assess learners' ability to identify and analyze common indoor air pollutant sources in commercial buildings (e.g., VOCs, particulate matter, bioaerosols), trace transport pathways (infiltration, interzonal flows, HVAC distribution), and evaluate how ventilation strategies and performance metrics (natural vs. mechanical ventilation, ACH, air change effectiveness, filtration) influence pollutant concentrations and occupant exposure; items will require interpreting data, applying basic mass-balance reasoning, and prioritizing mitigation options for realistic scenarios.