Lets say that the legally allowed limits of various pests which might infiltrate food production were taken as a guideline and 90% of those limits were intentionally added as filler, with the remaining 10% of the legal limit as a safety factor against recalls.

Would you agree that's a bad thing? This is intentionally dumping waste in a diluted form; but right in front of the possibility of a sea of cars which happen to not be in a traffic jam (35+ mph IIRC?). Well maybe the motor-home is safely and slowing taking the curves on a narrow 2 lane highway with no real opportunity for passing with a bunch of cars backed up behind it, forced to endure the exhausts.