Sealing our fate?

Briefly reviews ways of reducing levels of pollutant in the house. Concludes that the best method is to ensure adequate ventilation. Considers how this can be done whilst still conserving energy including the use of mechanical ventilation systems with heat exchangers in tight houses. Concludes that making houses tighter as an energy conservation measure should be approached with caution, as the identification of indoor pollutants and the introduction of indoor air quality standards is still in its infancy.