The plume of air-borne ash that recently grounded even the jet set for days in Northern Europe reminded us all that air space is our common heritage, precious and fragile. On the domestic scale, the air that we share where we live and work, that we breathe in and out together, is an essential component of our environment - no longer intangible and to be taken for granted. TLV in partnership with Philips and Ahlstrom was quick to respond to this trend with a plug-in air purifier - Plain air - designed by Patrick Norguet.