How does acid rain damage cars or how cars contribute to acid rain?

The emissions from automobiles have not shown to have a direct link to acid rain. Acid rain occurs when the toxic emissions from plants that process wood into paper products go up through the Stacks and the Scrubbers are either faulty or they have an Upset Condition, and the Scrubbers (which are a type of filtering system) are broken down, and the unfiltered waste which is So2, Nox, and several others. These toxin particulates that are less than 10 parts per million (ppm) are not visible to the human eye, but can be fatal; go up into the atmosphere and when it can finally rain, the yucky rain falls on houses, cars, trees, animals, people, streams, creeks, ground water etc. This causes at least erosion on metal surfaces.