Oslo Airport (OSL) Oslo Airport (OSL) One of three airports serving the Oslo region, Oslo Airport (OSL) is the second-busiest airport in Scandinavia and the 17th busiest in Europe. It serves as a hub for Air Norway, Norwegian Air Shuttle, Scandinavian Airlines and WiderÃ¸e.
Causes of Sinus Infection. Knowing the causes of sinus infection is beneficial to the patient and the layman for prevention of recurrent sinus infections! The most common cause of a sinus infection is the common cold, viral influenza and hay fever. The cold causes inflammation in the nasal passages and this inhibits the drainage of the sinuses which can cause them to become inflamed. When we have flu, our nose is filled with mucus.
Viruses. 1  Most sinus infections start with a cold. Colds are caused by a virus, which can make nasal tissue swell, blocking the holes that normally drain sinuses. 2  Because inflammation can block the nasal passages and prevent draining, allergies are often associated with sinus infections.