How many mothballs is appropriate at a time?

1 to 3. According to Query 39 Health Network, mothballs can be divided into natural mothballs and synthetic mothballs. Natural moth balls are aromatic organic compounds extracted from camphor tree branches and leaves, which are non-toxic, while synthetic moth balls contain naphthalene or p-dichlorobenzene, which is toxic. If you put more mothballs in a room at a time, it will affect the air quality in the room, and people will easily feel uncomfortable after inhaling too much. So between 65438 and 600.