Introduction :

• All of us face of veriety of risks to our health as we go about our day-to-day lives and being exposed to environmental pollutants all pose varying degrees of risks.
• Some risks are simply unavoidable and some we choose to accept because to do otherwise would restrict our ability to lead our lives the way we want . And some are risks we might decide to avoid if we had the opportunity to make inform choices.
• A Renowned of scientific evidence has indicated that the air within homes and buildings can be more seriously polluted than the outdoor air in even the largest and most industrialized cities.