"It is oxidized to SO2 which, when it cools with the water vapor in the exhaust stream, produces a goodly amount of sulfuric acid."
Yet if the tires are introduced into the fuel stream of a coal burning plant, there is a good chance that there is a SO2 scrubber downstream.
Not to mention that the pollution standards seem to be relaxed more at night when the gubmint observers are off-duty! ;^)