What is UV and how does it clean the air in my environment?

What is UV and how does it clean the air in my environment?

Ultraviolet (UV) is that part of electromagnetic light bounded by the lower wavelength extreme of the visible spectrum and the X-ray radiation band. The spectral range of UV light is between 100 and 400 nm and is invisible to human eyes. Using the CIE classification the UV spectrum is subdivided into three bands: UVA (long-wave) from 315 to 400 nm, UVB (medium-wave) from 280 to 315 nm and UV-C (short-wave) from 100 to 280 nm.

A strong germicidal effect is provided by radiation in the short-wave UV-C band, with 265 nm being the optimum wavelength. It is known to deactivate (break the DNA of) germs contained in tiny airborne droplets (droplet nuclei) that transmit diseases such as measles, tuberculosis, and influenza from person to person. Once the DNA of a microbe is broken it loses its ability to reproduce. Bacteria and viruses that cannot reproduce are rendered harmless.

The germicidal activity of ultraviolet radiation can be achieved with UV-C lamps. These lamps can be used to disinfect air that passes through ventilation equipment and also to keep surfaces clean from bacterial and especially fungal growth, avoiding this to become sources of microorganisms that end up in the air.

UV-C lamps are installed in a chamber of a UV disinfection unit. Air or water passes through the chamber and is subjected to the light. The light output will destroy the genetic structure of bacteria and viruses. The effective resistance of micro-organisms to UV radiation varies considerable. Therefore the right dose (intensity multiplied by exposure time) is important to deactivate bacteria, spores, moulds and viruses.