FACT: Phthalates do not leach from PVC to the environment (air, water, soil)
Phthalates are physically fixed with the PVC matrix which prevents their leaching out of the products made of plasticized PVC. The same is applicable to migration from free particulates (dust) of the plastic.
Phthalates may be released from the plastic when it is exposed to very high temperatures and/or solvents. Some small amounts of phthalates which may yet enter the environment will undergo biodegradation, and they will not be accumulated neither in the environment nor in living organisms.