Instruct: Classify Amazon reviews into positive or negative sentiment
Query: They smell terrible!

These Monster earphones smell terrible! Like toxic industrial waste. I hoped airing them out for a few weeks would help, but no. They sound great, but the smell is intolerable. Possibly unhealthful for human contact.An increasing number of products made in China smell terrible. They emit a horrible chemical smell. This is possibly a significant health problem for us, but how can we know for sure? China is one of the world's largest purchasers of recyclable material. Is there a connection?