When you live in an apartment, there are times when the air isn't very fresh. The space is small and odors tend to linger in the air. Cooking a delicious meal can result in smelling onions for days, and litter box odors can be a bit overwhelming at times. When pet hair and dust are added it can get very stuffy and smelly very quickly. I tend to experience winter allergies during the colder months, with a runny nose and frequent sneezes. I also have a sneezy cat (Lola), and her upper respiratory issues worsen when she's around dust. I