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How to clear nasal congestion quickly 
Gently blow your nose. 
Perhaps the easiest and quickest way to reduce nasal congestion is to simply blow your nose into a soft tissue. Unfortunately, it's not always possible to completely relieve congestion by merely blowing, but it's always a good starting point.
Combining periodic nose blowing with some of the techniques listed below is likely the best strategy. When blowing your nose, do it gently, otherwise you risk damaging the delicate nasal/sinus tissues and/or rupturing a small blood vessel.