if i remember correctly it is the larger amounts of carbon dioxide and dust in the air, it also is partly due to the fact that if the iar has not been moving about the carbon can settel in in parts of teh room, when the air is curculating or fresh air is comming in it evenly dispurses the carbon in the air, fresh air also can have less carbon dioxide in it, i alosm read that warmer air can make you feel stuffy as well, i am noit sure why that is though
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