Method and apparatus for purging unwanted substances from air

A method for removing unwanted substances from air, the method comprising:

• providing a non-thermal plasma reactor stage housing comprising an air inlet for receiving the air to be treated in the non-thermal plasma reactor stage housing, a plurality of non-thermal plasma reactor units for treating the air and an air outlet for exhausting the treated air from the non-thermal plasma reactor stage housing;
• wherein each of the plurality of non-thermal plasma reactor units comprises a dielectric substrate having a first surface and a second surface, a first electrode disposed on the first surface of the dielectric substrate and a second electrode disposed on the second surface of the dielectric substrate, wherein the first electrode comprises at least one window exposing the dielectric substrate to the air to be treated in the non-thermal plasma reactor stage housing;
• and
• passing the air to be treated through the non-thermal plasma reactor stage housing of the air treatment device.