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An installation containing a DC negative corona discharge reactor, a pulse corona discharge reactor and a combined electron beam and microwave induced plasma reactor is presented. SO₂ is removed up to 42% through spontaneous reaction with ammonia without electron beam or microwave irradiation at the temperature below 70°C. For the same removal efficiency of 98% for SO₂ and 80% for NO_x at separate EB irradiation of 40kGy, the required absorbed dose is about two times smaller for simultaneous electron beam and microwave irradiation. The SO₂ removal efficiency of simultaneous DC or positive discharge and microwave discharge is higher than separate DC, pulse and MW discharge. Also, the applied voltage level at which the removal efficiency reaches the maximum value is less than for the separate application of DC or pulse discharge. The NO_x removal efficiency of DC or pulse discharge suffers …