Dirty air ducts are partly responsible for poor indoor air quality and the negative effects of this bad air are numerous. With dirty air comes airborne contaminants like dust, pollen, mold, bacteria and a bunch of other allergens that render the air unsafe. While these contaminants may not have the same effect on everyone, the allergens pose a huge risk to people with sensitive respiratory systems or underlying respiratory conditions or even short-lived ailments like the flu or cold. If you haven't had your HVAC air ducts cleaned in a while or you are coming down more frequently with airborne illnesses, then you might consider scheduling air duct cleaning services because it is long overdue for one.