I'm looking for a tool or index that can determine the ventilation status of an average house based on the number of windows, rooms and persons on a given floor. Since the Pakistani population doesn't use Ventilation systems that are centralized hence this is a better approach to determine whether the house or dwelling is well ventilated, poorly ventilated or moderately ventilated. if anyone can help me out in this regard i would be grateful. This is specifically for an environmental health study and since the study is self funded i cannot invest in a device to measure air flow rates in a room. kindly advise me how to tackle this.