What do you call that smell / odor in English?

See that Chinese character circled in red.

We call this unpleasant smell as MUSTY usually. I'm NEVER a fan of Hong Kong from February to April (sometimes May too) because of the dampness! Oh, and my students told me that they had no idea that they could actually write that word in Chinese!

#Mustysmell #Mustyodor #Unpleasantsmell #Damp #Dampness #Laundry