Dirty air ducts can significantly impact indoor air quality, especially for people with respiratory conditions, allergies, or compromised immune systems. While clean ducts alone don’t guarantee perfect air quality, contaminated ducts definitely circulate pollutants throughout your home. Common contaminants include dust mites, pet dander, pollen, mold spores, and bacteria that accumulate over time. When your HVAC system runs, these particles get distributed to every room, potentially triggering allergic reactions or respiratory issues. Professional cleaning removes these accumulated contaminants and improves overall air circulation efficiency. Many customers notice reduced allergy symptoms and less dust settling on furniture after professional duct cleaning.