And it is a remark we get a lot:
"There is so much trash in the city, would you really eat what grows there?"
(And usually the answer is to use common sense, and wash everything thoroughly, and that the invisible trash of pesticides in non-urban environments may be even more harmful).
But let's face it: that's not the real question. Let's turn it around:
"There are so much edibles in the city, would you really throw trash on them?"