Common signs of poor indoor air quality include frequent, unexplained allergic symptoms such as persistent sneezing, coughing, watery eyes, and nasal congestion that worsen while indoors and improve when you leave the building. Other indicators include chronic headaches, fatigue, dizziness, skin irritation, and a heavy, stale, or musty odor lingering in rooms. Visually, you might notice dark mold patches on walls or window sills, excessive condensation pooling on glass panes, or a thick layer of dust rapidly accumulating on surfaces despite regular cleaning. If occupants experience recurring respiratory infections or worsening asthma attacks while inside the home, it serves as a strong warning sign that your indoor atmospheric environment is compromised.
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