Upper respiratory infections can cause this presentation: two cats in the same house-hold develop coughing/sneezing/wheezing symptoms within a relatively short time. If there is an underlying bacterial component, then oral antibiotic therapy will solve the problem (bordatella infection is an example).
If viral, then supportive care until resolution of symptoms: decongestants/antihistamines/appetite stimulants if sense of smell is compromised, perhaps interferon. If fungal (highly unlikely), then appropriate anti-fungals based on speciman isolation.
Certainly a foreign body can cause similiar symptoms, but not vey likely in two cats at the same time. Time to visit your veterinarian if things don't rapidly resolve.
Dr. Van Lienden
Dr. Raymond Van Lienden DVM
The Animal Clinic of Clifton
12702 Chapel Road, Clifton
Virginia, U.S.A. 20124