Health effects from IAQ problems can range from minor to serious, depending on the type of problem. Health effects can include headaches, tiredness, dizziness, nausea, itchy nose, irritated eyes, and scratchy throat. The symptoms usually go away once a person leaves a room or building. Over the long term, poor indoor air quality has been linked to obesity, diabetes, chronic respiratory disease, heart disease, and even cancer. Know the signs. Learn what you can do.