I have been told that debris/pollution from the road will find its way into my plants, but I don't know how much to be concerned about this.
We have a nice porch which could be used as a vegetable garden, but it is near a side street. It is, however, elevated from the street by a good 10-15'. Should I be concerned about toxins in my food?
What about a planter that is much closer? My neighbors have a vegetable garden that is set back about 20' from a major road (45 mph), at ground level. Should they be concerned?