... stink,weat, etc; 3,display the calendar. Air tester PWJ-5P(display the air pollution index)1,newest calendar desigen:display year, moth ... VOC, dust bacteria, stink,weat, etc;3,real-time display air pollution index air pollution index:0-250 0-80(green light) represent excellen ... and blue light will alarm, remind users that air has reached thelevel pollution,suggust users open the window to take a breath ...