Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Smelly and loud

This air purifier is really loud, even on the lowest setting and the air that is pushed out is like having a box fan on. Not so good on colder days. The worst thing is that this gives off a wet dog smell. When I change out the filter, it is fine for a couple days, then the wet dog smell returns. It is strong! Blue light is annoying. Upset I spent so much money on something i cannot use comfortably.