It's important to treat the cause of a sinus problem. If you have allergies, talk with your doctor about treatment. Or ask about getting an evaluation by an allergy specialist. If you're exposed to nasal irritants, such as sawdust, use a filter mask. If you smoke, ask your doctor for help with quitting. Smoke irritates the sinuses and can make your sinus problem worse. If you live with people who smoke, ask them to think about quitting or only smoking outdoors. If you live in an area with severe air pollution, keep track of the air quality index. Try to limit outdoor time on days with high pollution levels.