title: A comparison between tracer gas and tracer particle techniques in evaluating the efficiency of ventilation in operating theatres.
mesh_terms: D000391:Air Microbiology; D001419:Bacteria / Q000302:isolation & purification; D005069:Evaluation Studies as Topic; D009609:Nitrous Oxide; D009873:Operating Rooms; D011193:Potassium Iodide; D014691:Ventilation
chemical_list: D011193:Potassium Iodide; D009609:Nitrous Oxide