Iguana Sneezing?

My 1yr 4 month old iguana has been sneezing over the past few days and I don't know whether to worry or not. Ive seen him sneeze before, but now i notice him doing it a few times a day, for the last few days. The temp hasn't got below 83-85 degrees during the day, and not below 78-80 @ night. He's been eating regular, and gettin' in and out of the tub of water (his bath) daily when we put it in there. Any need for me to worry ?