According to the WHO, the acceptable limit is 25 milligrams of propylene glycol per kilogram of your body weight. In the U.S., the average exposure is about 34 milligrams per kilogram of body weight.

Orlen has opened in Trzebinia, Poland, what it calls Europe’s largest biobased propylene glycol plant. The $100 million plant has a capacity of 30,000 metric tons per year, the firm says ...