I believe that the filtering and oxygen production of green plants is well established. Do those plants NASA approves for air filtration "emit" anything other than clean oxygen and perhaps benign esters (?) that would be a concern in an operating theater or are they environmentally benign?
My thought is that a well selected set of plants throughout the hospital might give the facility an edge in cleansing the environment that continues to elude hospitals using a more "clean room" approach.
Naive? Do these plants help eliminate airborne disease or would they contribute more filth to the environment?