There are no methods that have been tested and proven to prevent sinusitis. However, your doctor may recommend a variety of measures that may provide you with some benefit.

Keep your nose as moist as possible with frequent use of saline (salt) sprays. Avoid very dry indoor environments and use a humidifier.  Avoid exposure to irritants, such as cigarette and cigar smoke or strong odors from chemicals. Avoid exposure to anything you're allergic to.

You may find that air travel poses a problem if you are suffering from sinusitis. As air pressure in a plane is reduced, pressure can build up in your head, blocking your sinuses or the eustachian tubes in your ears. As a result, you might feel discomfort in your sinuses or middle ear during the plane’s ascent or descent. Some doctors recommend using decongestant nose drops or sprays before a flight to avoid this problem.