You'd kind of have to understand how the fallout effects the paint, or at what rate does the fallout cause the pitting in the paint of the cars parked at your place of work.
I am far from a chemist, and a complete understanding of what is actually going on at a chemical level concerning those fallouts versus automotive paints is well beyond my scope of knowledge and understanding.
I would think that this page
Definitions of oxidation and reduction (redox) could be a place to start in understanding how these pits are caused.
Having said that, and putting that thought aside, I think a coating like Opti-Coat 2.0 could be applied as a sacrificial barrier to take the beating instead of your car's clear coat taking the beating by itself, as we've already established that this would in fact be the case.
I don't believe for a second that Opti-Coat 2.0 or any other coating would be completely impervious to damage from the fallout you are dealing with, but... It has not been yet established at what rate the fallout is in fact causing the pitting currently, and I do believe that Opti-Coat might be effected at a slower rate that your typical clear coat.
The film build (thickness) of the applied coating, once applied, would have to be inspected and followed very closely perhaps using a lighted pocket microscope on a weekly basis. The use of something like Iron-X (once the coating is fully cured) will not diminish the film build of the Optimum coating, and could be used periodically as a fallout remover, as claying would likely scratch the heck out of and even possibly abrade off the applied coating.
It could be an expensive solution to Iron-X regularly, and apply Opti-Coat 2.0 semi annually, or more frequently depending on what rate the fallout diminishes the coating in the way of pitting...who knows...your expectations may be exceeded by the performance of the coating.
Sounds like you are in a unique situation to do some extreme testing of whatever coating you might try if you did choose to try one.
One thing for certain is, that if you have a coating applied, and the coating gradually becomes effected by the fallout, and is Iron-X'd free of gritty fallout, abraded off with a lightly abrasive polish then re-applied, this should preserve your underlying clear coat.
Certainly no definitive answer to your question, perhaps only you can answer your own question through application and follow up, then come back and post your findings here.