 Thunderstorm, because it smells like a thunderstorm, has rolled through, left that clean, fresh air, takes all that garbage out of the air. Talking about viruses, mold, odors, whatever's in the air, it goes after them and destroys them using Oxy technology. It sends out O3 molecules into your home that destroy bad odors rather than just covering them up. Candles and cover-up sprays just do that. They cover up. Air fresheners cover it up. They're hiding it.