Isn't it fucked up that cars poison the food?

There are numerous fruit trees and bushes on the side of the road where I walk my dog. I get tempted to eat from them from time to time, but I always wonder whether the road is far away/the traffic is light enough for this to be safe. My grandparents stopped growing fruit bushes in the city because a busy parking lot was built adjacent to their plot of land here and they worried about what it would do to the soil quality. I can never buy chanterelles because I don't know for sure whether they were picked up close to a road and therefore lead-poisoned. I wish I could grow and forage and buy local food just like my grandparents used to do, but car-related pollution makes it quite hard.