I have had bad cat allergies to cat hair- it's probably not a good idea to have cats if you have asthma or other lung diseases
The most likely cause of your felines sneezing is calicivirus (i think I spelt that wrong tho) or a herpes type virus. These CANNOT be transmitted to humans (minus two uncommon infections can cause mild illness in immuno-comprised patients.
good overall info on causes
http://www.aspcapro.org/feline-uri.php
My comment does NOT necessarily mean that every case of feline pneumonia is caused by an organism that can cause harm to humans. You should not abandon your pet, simply because it is sick. On the other hand, it pays to exercise reasonable precautions and always consult with a vet.
ok-hopefully he doesn't get pneumonia!! Also; along those precautionary lines that you mentioned, pregnant ladies shouldn't change litter pans. Not relevant to this topic-just a general knowledge comment.
At the risk of inflaming cat lovers, certain organisms that cause pneumonia in cats can cause leukemia in humans.
It is not a good idea to be around cats with respiratory diseases.
The answer is yes-thanks anyway.