I think the fallout would cause acid rain? But yeah. Itd sorta balance out in the long run seeing as theres no pollution from vehicles/factories etc.
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fallout would not cause acid rain. they have nothing to do with each other.
acid rain is mostly caused by hydrocarbon emissions, particularly from cars and coal-fired power plants. both generate sulfur dioxide, which dissolves in water (ie, clouds), particularly in the presence of ozone (ie, higher up), to form sulfuric acid in the atmosphere and falls on things in rain. hence acid rain.
if the apocalypse was recent, there should still be acid rain, especially if robots are still running power plants, or perhaps if volcanoes are erupting, which could release a lot of sulfur dioxide.