A system for gas sterilization includes a sterilization chamber or a pre-chamber, a source of liquid NO2, a valve arrangement, a controller and a sterilant gas remediation mechanism. Embodiments relate to devices for delivering humidified air to a sterilization chamber, devices for removing gaseous NO2 from an exhaust gas stream of a sterilization chamber. Some embodiments relate to hardware and software for user interface in a sterilizing device and hardware and software for control of a sterilization cycle.
