Poor indoor air quality can lead to discomfort, health issues, and damage to belongings. Symptoms include sneezing, coughing, and musty odors, which may indicate biological contaminants like mold or stagnant water. High humidity can worsen these conditions, potentially leading to mold growth and damage to furniture, walls, and fabrics. Homes with poorly sealed ductwork or blocked drainage lines are particularly at risk. Sensitive groups, such as children and individuals with allergies, may experience heightened symptoms, emphasizing the importance of addressing these issues promptly.