Is that because of ouija board?

The quiji board is used in bring on the paranormal. I have heard by a few that their experiences have opened up the door for unwanted and evil spirits. This may be the case with you. There are evil spirits called Fowl Spirits, and when they are welcomed into a room or a house, you will experience a bad odor. I would strongly suggest getting rid of the board and if that doesnt help, you may have to try other means to get the spirit out.