A bipolar ionization device in which fiberglass is used as the dielectric. In one embodiment, a fiberglass board is used, with the anode on one side of the board and the cathode on the other side of the board. A number of flat boards can be stacked, with spacing between them to allow air flow to scavenge ions, with stanchions providing both mounting and electrical connections to the ionization devices. In another embodiment, a fiberglass tube is used, with the cathode inside the tube and the anode outside the tube.