Hi all
I am not sure whether the following topic had been mentioned
It is with regards of the safety of street food in Beijing
According to my observation I have seen a lot of food stand on the street where they sell boiled corn; I can smell the aroma whenever I walk past there

But I found that most all the vendors place the boiled corn in a pot on stove and keep heating meanwhile with a kind of plastic wrapping the top in the hope of shielding the corn from dust or impurities out of the open air I guess
but the issue I have is that whether the plastic is safe ,is it for possible for the plastic to produce any hazards when heating and affecting the safety of the corn
I know there is boilable plastic bag for food, but how to make a judgment if what the vendors applied is one for food thickness maybe?
Any experts or savvy travelers shed a light

Hope the topic is not to trivial too bring up

Thank for you in advance for any tips or education