Is it possible that ozone can naturally be occurring in a room?

recently, at certain times I can smell ozone in my bedroom, just for a few second. I don't have air purifier, ozonizer or ionizer. I live in tropical climate and I open my window when it's hot in the room, rarely use air conditioner. (the smell only occur when the all windows are closed). It really puzzled me from where the ozone smell possibly comes from.