Air Pollutants and Irritants
Contaminated air inside and outside your house can cause sinus problems. Cigarette smoke and other air pollutants decrease the effectiveness of the mucociliary transport system in the nose and sinuses, which can result in swelling and congestion, says Kelleher. Cigarette smoke both from smoking or exposure to secondhand smoke contains chemicals and irritants that can make allergies worse and cause other sinus problems. Wood smoke, smog, fumes, and dust are other common sources of irritants.