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Buildings use energy, materials, water, and land to create the right environment for their occupants. All of these things cost money – and all of them have an environmental impact.
Besides considerations of thermal comfort, indoor air quality means that the chemical composition of indoor air is clean and fresh. This means avoiding chemical pollutants, particulates, pollen, mold and mildew, pathogens, and other unwanted substances in the air, as well as bringing in new air at an adequate rate.