Cat Sneezes

Myc at Harry has taken to sneezing in sets of 3. He'll be walking into the living room, stop for a moment, and sneeze away. It's been cold in my apartment lately but does that really effect cats? I think the culprit might be the perfumed cat litter I have right now. I ordered unscented from Peapod delivery, but 2 of the boxes came with 'fresh scent'. Every time I scoop it I sneeze, so maybe Harry and I have the same problem. Anybody want an unopened box of Arm + Hammer Super Scoop Fresh Scent litter?!?