The Chlorine Rating is based on the occurrence and concentration of chlorine in all vehicle and child car seat components. It indicates the relative concern associated with levels of chlorine detected in the product, in comparison to all other products tested. The rating ranges from 0 to 5, with 0 representing products with the relative lowest concern and 5 the relative highest.
Chlorine is likely associated with the use of polyvinyl chloride (PVC), a widely used type of plastics that is of concern to the environment and public health during all phases of its life cycle. PVC contains chemicals called phthalates, some of which have been associated with decreased fertility, pre-term deliveries, and damage to the liver, testes, thyroid, ovaries, kidneys, and blood. There is also evidence that phthalates can pass from mothers to babies through the placenta and through breast milk.
Learn more about PVC and phthalates