The cage was just built and delivered to my house...I feel it's the clear door and hinges that are off gassing. My identical cage has no hint of odor to it but it probably did when it was brand new. I get the smell when the door is just opened after a few hours...then it's gone in a matter of seconds. It's not real harsh...it's a faint smell. Like plastic or something. Wonder if baking soda will work