Outdoor air is designed to

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Outdoor air is designed to dilute contaminants. By bringing in outdoor air and exhausting indoor air at a controlled rate, the concentration of pollutants produced inside the space is lowered, improving indoor air quality. The effectiveness depends on how much outdoor air is used (ventilation rate), the outdoor air quality, and any filtration or treatment in the system. The other options don’t capture the primary purpose: removing humidity is handled by dehumidification and HVAC controls, cooling indoor air is done by the cooling system, and outdoor air can carry odors but that isn’t its intended function.