Welding smoke and dusts are captured into purifier via exhaust hood to pre-filter via tiny holes filtering mesh, then go into ionization zone of plasma electric field for charged adsorption, high-energy ions in plasma play a decisive role. Meteor shower high energy plasma will have a elastic collision with dielectric molecules, changing the energy to internal energy of ground state molecules, will have such process as motivating, electrolysis and ionization to make the polluted medium in activation. Polluted medium produces freedom active group in the effect of plasma, activated polluted molecules are removed after plasma oriented chain chemical reaction. Smoke and dusts are captured, noxious gas is reacting into harmless gas after ionization purification and ozone oxidation. Air after purification has a good reducibility, no dusts and no peculiar smell and can be fed back to atmosphere.