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In a perfect world, rain water would still pick up natural particles in the atmosphere as it condenses and drops out. We get dirt in the atmosphere that is blown all the way across the atlantic ocean from winds in Africa every summer. If a volcano is active then sulfurous particles will be in the atmosphere. These are natural but auto exhaust and industrial exhaust are man made.
Most of the old steel manufacturers that used to be in the mid west are disbursed around the country now and use different methods to make the stuff than they did in the past. Auto emissions are a lot cleaner now that they have ever been so the rain in the mid west is likely not near as acidic as it once was. It's the salt on the roads in the winter that still eats up car bodies. All I see from atomized coal slurry fired power plants in the modern era is steam vapor coming up from the condensers. The carbon black plants all moved to China and India so folks don't see much black smoke coming from industrial sources now days. I would say that rain water is still drinkable but it ain't like distilled water where most contaminanis are removed. Distilling water depends on the source water. Some compounds will vaporize along with the water so there is always something left. Reverse osmosis is the only way to remove most all contaminants and be affordable. This will remove lead, mercury, & uranium as well as many other contaminants.