Most disposable plastic bags are made of PVC. PVC is mostly recovered from wastes, including industrial and medical wastes. Most of these plastic bags contain PVC. And PVC is a toxic chemical raw material. When encountering acidic and oily substances, toxic components are easily released. Contact with hot food, when the temperature exceeds 50℃, toxic components in plastic bags will seep out and pollute the food; When the temperature reaches 80℃, it will be melted by heat and release toxic substances.

In fact, when people buy breakfast from stall vendors, it is best to bring their own PE fresh-keeping bags. Some regular supermarkets also use PE fresh-keeping bagged food, which can be used with confidence. Supermarkets often pack bulk food in plastic bags, and each small package will also be marked with the word "QS". Unmarked disposable plastic bags will be banned from being used in food packaging.

So it can be concluded that it is really bad!