Sneezing after morning commute

This is driving me crazy. Every morning when I get into work, after getting cleaned up / changed, I sit down at my desk and start sneezing. Like properly sneezing.
Now I dont mean to disgust but its proper "snotty" sneezes......the "snot" is clear which I guess is a good thing but its driving me insane as it lasts a good 15 - 20 minutes every morning.
It doesnt seem to matter what the weather is like - cold/hot rain/dry it always happens.
So im the weirdo in the office that cycles in and has a toilet roll in his desk!
I have got hayfever, and mild asthma, but this sneezing doesnt seem to be consistant with either - I have no other symptoms, I feel great otherwise.
Am I just allergic to work???
Now I dont mean to disgust but its proper "snotty" sneezes......the "snot" is clear which I guess is a good thing but its driving me insane as it lasts a good 15 - 20 minutes every morning.
It doesnt seem to matter what the weather is like - cold/hot rain/dry it always happens.
So im the weirdo in the office that cycles in and has a toilet roll in his desk!
I have got hayfever, and mild asthma, but this sneezing doesnt seem to be consistant with either - I have no other symptoms, I feel great otherwise.
Am I just allergic to work???
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2009 Specialized Tricross Sport
2011 Trek Madone 4.5
2012 Felt F65X
Proud CX Pervert and quiet roadie. 12 mile commuter
I get the normal exercise-induced rhinitis which stops when I stop cycling no worries, but then when I sit down at teh desk, bosh, its starts. I wondered whether is was a dusty workplace or some strange pollen on the way in!
FCN 4 sometimes
But if I come in on the train / by car im fine? Does excercise make you more prone to dust etc?