Quote Originally Posted by Onix View Post
But, I suppose since I am breathing much more deeply when I ride...maybe?
I'd guess it's less that, and more that your riding probably takes you places where the concentration of allergens is much higher - unless you already live in the country, there's a big difference in the amount of pollen in the air in the country, vs. in a small town, vs. in the city. (Those of us who are very sensitive notice that immediately!)

For me, the hard breathing is kind of a "wash," since the immune system is slightly suppressed during exertion. My allergies are actually much better during a ride, but my asthma is very mild and 100% allergic, not at all induced by exercise, or cold or dry air.

High speed ("ram air induction" ) does seem to increase the amount of pollen that goes up my nose, but I really only notice that on the moto, not the bici.