Mexico is the same and it has been the same for over 50 years. I remember being there as a child and pretty much ate oatmeal the whole time I was there; since I was served raw chicken once.
Their smog is terrible and their water too.
Mexico put in auto usage restrictions and emissions control 15 years ago. The problem, however, is not with the cars, but with the gas that is used for cooking down there by the average Mexican, to say nothing for the extensive use of charcoal.