[header] How to rid your house of odors [title] Check for a gas leak. [step] Is it a strong (especially sudden) " rotten eggs " smell? Heating and cooking gases such as propane and natural gas contain a noxious scent, in order to indicate a possible leak. This is a potentially dangerous situation. 
If this is a possibility : [substeps] Have all people exit the living quarters immediately. Open windows and doors to ventilate.