Process for removal of sulfur dioxide from off gases

The present disclosure relates to a process and a process plant for conversion of SO2 in a process gas to H2SO4, comprising a first step of spraying a first aqueous stream comprising H2O2 directly into the process gas enclosure for a first conversion of SO2 to provide a first converted process gas, and a second step of directing said first converted process gas and a second aqueous stream comprising H2O2 to a scrubber tower to provide a further converted process gas, wherein the concentration of H2O2 of said first aqueous stream is higher than the concentration of H2O2 of said second aqueous stream. This has the associated benefit of such a process being efficient in conversion of SO2 while also minimizing consumption and environmental release of H2O2.