The goal of this study was to investigate the effectiveness of three common approaches to upgrading residential mechanical ventilation systems in existing homes for improving asthma-related health outcomes, reducing indoor pollutants of both indoor and outdoor origin, and maintaining adequate environmental conditions and ventilation rates in a cohort of adult asthmatics in existing homes in Chicago, IL.
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Asthma Control
Timeframe: Each month throughout the study completion, an average of 2 years (24 months)