... to take a breath or leave the room VOC(volatile organic compound): 0-90 0-40(green light) represent low volatile gases ... 71-99(red light) represent high volatile gases4, VOC(volatile organic compound): Quality display light show red will alarm, remind users that ... tester bacteria, dust, stink, sweat, etc. VOC is test the organic volatic gas in the air, mainly tolunene, xylene etc(home ...