The use of UV lights is generally safe, but the metallic smell you may detect is likely due to the production of ozone gas by UV-C lights. When UV-C light hits metals, such as aluminum, it has enough energy to expel electrons from them. After each use, a UV sterilizer may emit an odor that can be hazardous to your baby. This smell is actually a chemical called benzene, which is a known carcinogen.
Benzene is a natural by-product of the disinfecting agent in a UV sterilizer. It's a toxic chemical that can cause headaches, dizziness, and nausea. Benzene is also a known carcinogen, and can be damaging to your baby since you can't smell it and you'll be exposed to it for an extended period of time. Some UV products may also leave an unpleasant odor after the cycle is over. While the smell isn't dangerous, it's another reason to consider leaving the room during and after the cycle.
Installing an indicator light outside a room is one more step to guarantee that no one enters while a germicidal UV lamp is operating. In conclusion, it's important to be aware of the potential risks associated with using UV lights. The metallic smell you may detect is likely due to the production of ozone gas by UV-C lights. Additionally, benzene is a natural by-product of the disinfecting agent in a UV sterilizer and can be hazardous to your baby. To ensure safety, consider leaving the room during and after the cycle and installing an indicator light outside the room.