The present invention relates to the inactivation of viruses and/or bacteria of at least 50%, or the disinfection and sanitization from bacteria and/or viruses, in spaces, surfaces or objects using an electromagnetic radiation having a wavelength comprised between 410 nm and 430 nm. In particular, it relates to a method comprising irradiating the area to be disinfected or sanitized with an electromagnetic radiation having a wavelength comprised between 410 nm and 430 nm for a time interval comprised between 5 minutes and 180 minutes, a power density comprised between 13 mW/cm 2 and 120 mW/cm 2 and an energy density comprised between 30 J/cm 2 and 220 J/cm 2 , wherein the electromagnetic radiation is irradiated at a distance between the source of the electromagnetic radiation and the irradiated space, surface or object comprised from 30 centimetres to 1,5 meter.