Hi
I haven’t personally heard of cats adopted from hotter countries sneezing in uk.
There will definitely be be a reason for it. A good clue is that both of them are doing it so
If all illnesses like cat flu, respiratory illness etc are all cleared by your vet for them both, it has to be something in the house causing it.
Try and work out what was about when they started sneezing. Have they food been changed? Any smalls or vapour about before?
Do they sneeze all the time or in certain rooms etc etc
Not heard of smoke causing excessive sneezing but it may be, try for a few days not smoking near them and see if it stops.
Common Causes of Cat Sneezing:
Allergies:
Cats can be allergic to things like dust, pollen, mold, or even certain foods.
Irritants:
Noxious odors, household chemicals, dust, or smoke can irritate a cat's nasal passages.
It’s trial and error to see what the cause can be.
X