Although, I personally, am not allergic to much, I keep a candle burning most of the day and night to help clear the air of dust and allergins. Also, an oil-burning lamp helps much to clear the air. If you decide to try this, I suggest that you place the candle in a sizeable pot or cauldron, somewhere that if a cat knocks it over, it won't start a fire. So far none of my furkids have bothered either incendiary device. This same idea helps to clear out much of the odor in their litterbox area as well.

.........wayne