We further tested the catalyst containing air recirculation system's ability to remove formaldehyde from the air when it emanates from surgical smoke and is accompanied by particles, biological material, water vapor and a variety of additional VOCs. Electrosurgical cuts were applied to porcine muscle in a simulated OR without ventilation. The air recirculation device was in operation throughout the procedure, however, carbon filtration and catalyst were not added to the device until the room had significantly high levels of detected formaldehyde. After formaldehyde levels increased by almost 2.4 ppm, no further surgical cuts were made. The decay was then monitored for a period of 1 hour. When both catalyst and activated carbon are present, the elevated formaldehyde concentration decreases by 34%. When activated carbon is present without the catalyst, the reduction is only 13%.