No – it does not mean that. Like all foam mattresses, our mattresses will emit a slight chemical odor when you open the box. This form of off-gassing is normal for mattresses, so don't worry about it. Let the mattress air for a while. The smell should disappear after about 2-3 days. This is normal for foam mattresses. CertiPUR-US means that they have been made without environmentally hazardous materials. The chemical smell is not harmful and will start to dissipate once the mattress is exposed to fresh air.