The nose is a really good filter of particles in the air. One way that the nose does this is due to the fact that air changes direction through 90 degrees when it passes from the entrance into the main space of the nose (the nasal cavity). This sudden change spins suspended matter out of the main air stream and onto the sticky surface of the inside of the nose.3
Secondly, the airflow speeds up as it passes through the nostrils (the narrowest part of the nose) and then slows as the air stream enters the nasal cavity. The changes in direction and speed of the air stream happen over the same area of the nose, and the slowing of the airflow at this point deposits particles from the air onto the skin inside the nose.3
How does a blocked nose affect breathing?
If the mucous membrane in your nose becomes irritated, causing inflammation, you tend to end up with a stuffy, or blocked nose. This makes breathing through your nose difficult, making it hard to sleep and making you feel tired.8
Using a nasal decongestant can help you relieve congestion and breathe more easily, day and night. The main active ingredient in Otrivin Adult Nasal Spray is xylometazoline, which starts to relieve nasal congestion in 5 minutes and continues to work for up to 10 hours.8
Xylometazoline acts directly on the blood vessels that line the nose. By working directly on the affected area, it can quickly reduce swelling, drain the sinuses and relieve congestion.8