The key thing to remember is the concentrations that you breathe from lightning and electric motors are very low and of a short duration. There is some discussion about the danger of the ozone generated by laser printers but that is another topic. Ozone generators use an electrical mechanism to generate Ozone gas. Ozone generators will clean the air. Bacteria in the air are neutralized.
Ozone reacts with most airborne particles and the particles are attracted to floor and walls.
The particles are not in the air for you to breathe but they do build up on your floors and walls. People that claim that Ozone generators will reduce air borne pollutants are correct. The problem of removing the residue that builds up on the floors and walls is ignored. The problem is the Ozone cleaners are dangerous. Ozone is dangerous to humans and plants even at very low concentrations.