Ultraviolet germicidal irradiation(UVGI)has been in use for air and surface disinfection for the better part of a century,and yet for the past few decades it was considered to have doubtful and unpredictable effectiveness for controlling airborne contamination.Things have changed,and with the advent of improved equipment and new analytical methods,UVGI design has been transformed from an art into a science.Current concerns about bioterrorism also have added new impetus to research and development of this and other immune building technologies.Ultraviolet and Photocatalytic Oxidation will soon elevate UVGI yet to another level.
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