Allergies act up after workout?

[JustCurious]

Does anyone have a valid reason why after a 30+ min cardio workout, I'd have a really bad case of sneezing and sniffling?

I feel just fine during the workout, but about 5 minutes later during a cooldown stretch, I literally feel like I'm dying I'm sneezing so bad and hard.

I thought it was the gym I work out at, but this has happened before in other locations; usually only happens indoors.

But why does this happen? And why immediately following my workout?

References would be great. Thanks in advance. 10 points to best answer.

[Asynjur]

This is just a guess, but you are moving a lot more air through your lungs when you work out. So if there's anything in the air that bothers you, you just got an extra large dose of it.