... stink,weat, etc;3,real-time display air pollution index air pollution index:0-250 0-80(green light ... blue light will alarm, remind users that air has reached thelevel pollution,suggust users open the ... light show red will alarm, remind users that air has reached the level of pollution, suggesting users ... VOC is test the organic volatic gas in the air, mainly tolunene, xylene etc(home decoration,volatile ...