... bacteria, stink,weat, etc; 3,display the calendar. Sell air tester PWJ-5P1,newest calendar desigen:display year, ... reached thelevel pollution,suggust users open the window to take a breath or leave the room VOC ... level of pollution, suggesting users open the window to take a breath or leave the room harmful gas ... level of pollution, suggestion users open the window to take a breath or leave the room Our ...