For me, SOB is really my second biggest symptom (first being sinus infections- they always come first <img src="i/expressions/face-icon-small-wink.gif" border="0"> ). Since Spring and Fall are the biggest times that pollen is produced, it certainly could be an allergy issue. Starting Singulair made the biggest difference in my sinus infections (don't have nearly as many now) and the Advair has made the biggest difference in my SOB issues (inflamation from allergies).