I bought this rug for my daughter's bedroom based on the other mostly positive reviews. We were very pleased when we first got the rug. I did notice a chemical odor but figured it would dissipate over time. Unfortunately, after 3 weeks, the smell still hadn't gone away. It was especially noticeable with the bedroom door closed. It got so bad that despite the chilly evenings, we had to leave our daughter's window open at night while simultaneously keeping a space heater on just to make sure her room was being ventilated. I found a thread on apartmenttherapy that talks about the smell being caused by either pesticides sprayed into the wool or the adhesive used in the backing. Either way, the smell is permanent and I began worrying about my daughter's health from being exposed to this chemical smell every night. My husband even said that when he stayed in her bedroom too long (if he fell asleep while putting her to bed) he would wake up with irritation in his throat and sinuses. We returned this rug and in the future, we will probably make sure to purchase our rugs in person rather than online to make sure we don't run into this problem again.