We live very close to the ocean, on ground floor with a big backyard, so people with severe allergies might be sensitive. We have however welcomed family and friends from overseas without any issues, and were very surprised and really sorry to find out Ada had faced difficulties at our place. Too bad we didn't find out about this until after they were back home and we didn't have an opportunity to find a solution together.
We used to have a moth problem in a previous apartment, and since that time, I've been using moth balls in my knitwear to protect it.
Following Ada's comment, I'm looking into more natural ways to prevent any moth issue. Thanks Ada!