The Other Chemicals Rating is based on the occurrence and concentration of antimony, arsenic, chromium, cobalt, copper, mercury, nickel and tin in all vehicle and child car seat components. It indicates the relative level of concern associated with levels of these substances detected in the product in comparison to all other products tested. The rating ranges from 0 to 5, with 0 representing vehicles with the relative lowest concern and 5 the relative highest concern. The substances in this category are allergens, carcinogens, or cause other adverse health impacts depending on the concentrations and exposure levels.