hay fever

It's May 1st in New York. The composition of the air is roughly 50% pollen and 50% nitrogen, oxygen, etc. Could anyone use a decongestant? How about an effective decongestant? How do you pick the right one?
Not only is spring a beautiful time of year for those of us in the temperate zones, but it is also a financially lucrative period for companies in the business of making tissues, antihistamines, decongestants and other items to help deal with alle