I recall there was a major push against Acid Rain in the 70s-90s. If SO2 emissions were effectively regulated in that period (easy to do because “acid” is scary

I recall there was a major push against Acid Rain in the 70s-90s. If SO2 emissions were effectively regulated in that period (easy to do because “acid” is scary) then what magnitude of impact did that have on our post-90s warming?