Abstract: An improved air purification apparatus is disclosed including an arrangement for subjecting air to an electrical discharge for generation of oxygen molecules having a heavier than normal molecular weight. The apparatus includes a modular generator assembly including a plurality of flattened coils of metal wire mesh disposed in a side-by-side array with dielectric plates across which an electrical potential is created. The generator includes a unitary housing for obtaining the electrode elements in their array which facilitates assembly and disassembly of the generator, and mounting of the generator on the chassis of the air purification apparatus.