Depends entirely on the concentration. Here in the U.S. (and elsewhere) there's a concern about acid rain. Emissions of sulphur (sulfur?) from smoke stacks, primarily electric generation using coal as a fuel source, are forced fairly high into the atmosphere by the heat of the smoke, mixes with rainfall and falls as slightly acidic precipitation. In some cases the concentration is high enough to cause vegetation damage, in other cases the H2SO4.is barely measurable. So, the amount, as in volume, can only be determined by knowing the level of the concentrate...