UV sterilizers emit a small amount of ozone after each use, which is the cause of the unpleasant smell. The level of ozone produced is so small that it does not pose a danger to human health, but it can still lead to odors in the air. Ozone is a type of gas created when ultraviolet (UV) light interacts with oxygen molecules in the air, and this reaction produces a strong odor that can be detected by humans. Ozone is also known to be an irritant, so it can cause coughing, sneezing, and other respiratory issues. The smell from UV sterilizers is usually strongest immediately after use, as the ozone has not had time to dissipate yet.
Over time, the smell will fade as the ozone dissipates into the air. However, it is important to note that the smell may linger for some time, depending on the size of the room and other factors. In order to reduce the smell from UV sterilizers, it is important to ensure that the room is well-ventilated. Opening windows and doors can help to disperse the ozone more quickly. Additionally, it is important to make sure that the UV sterilizer is not placed too close to people or pets, as this can increase their exposure to ozone. Overall, UV sterilizers emit a small amount of ozone after each use which causes an unpleasant odor.
The actual level obtained after UV disinfection is negligible and, therefore, it is concluded that the VOCs responsible for the residual odor after UV disinfection do not pose a danger to human health.