How do I know if my indoor air quality is bad?

You can determine if your indoor air quality is bad by paying attention to physical health symptoms, environmental warning signs, and readings from electronic monitoring devices. Common personal indicators include frequent, unexplained allergic flare-ups like persistent sneezing, coughing, watery eyes, and nasal congestion that consistently worsen while indoors and improve when you leave the building. Environmental red flags include a heavy, stale, or musty odor lingering in rooms, visible mold patches on walls or window sills, excessive condensation pooling on glass panes, and a thick layer of dust rapidly accumulating on surfaces despite regular cleaning. Installing a digital air quality monitor provides definitive, real-time data on particulate matter and chemical concentrations.