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.
Most common respiratory tract infections such as colds, sore throats, sinusitis and laryngitis are caused by viruses. One type of virus can cause more than one type of RTI. For example, the viruses that cause a cold can also cause: 1  sinus infections (sinusitis).