SO2 does not easily become SO3. That requires high temperature combustion with oxygen. SO2 can react with H2O to become H2SO3, sulfurous acid, but a big study established that there were no "acid rains." Just an acidic buildup in groundwater soaking in conifer needles.
SO2 does not easily become SO3. That requires high temperature combustion with oxygen. SO2 can react with H2O to become H2SO3, sulfurous acid, but a big study established that there were no "acid rains." Just an acidic buildup in groundwater soaking in conifer needles.