Recognition of the problem of "indoor air pollution" (IAP) and its deleterious effects of health is growing worldwide as efforts increase to understand and articulate the complex health-air pollution linkages. Recent WHO estimates indicate that indoor smoke for solid fuels causes 1.6 million deaths annually and accounts for 2.7 percent of the global burden of disease. In Guatemala, adverse health impacts of IAP disproportionately affect children in poor, rural households of which 97 percent use fuelwood as the dominant cooking fuel.