A portable chilled air respirator device is used to treat air. Ambient air is drawn into an inlet of the device. The air is passed through a filter to filter the air. The air is cooled and dehydrated, such as by being passed over a reactant to create an endothermic reaction. The air is then secondarily cooled and rehydrated, such as by a secondary endothermic release of energy in an evaporative process, before being directed through the outlet of the device.