The use of solid fuels for cooking causes serious household air pollution (HAP). 2.9 million people died globally in 2015 from harmful exposure to PM2.5 emissions from cooking with solid fuels according to the Global Burden of Disease Project (Forouzanfar et al, 2016). This makes HAP one of the leading health risk factors in developing countries. 41% of households globally relied on solid fuels for cooking in 2010. Over half of the population in Guatemala, Honduras and Nicaragua cook with solid fuels. Major health effects of HAP from theses fuels are estimated in this report for the three countries, and benefits and costs of two widely promoted cookstove interventions for control of HAP are assessed.