According to China building energy conservation in 2012, the northern towns heating energy consumption is 171
million tce by 2012, accounting for 24.7% of building energy consumption[2]. Approximately one-half of the
China‘s population relies on1 biomass-cornstalk, wood, crop residues, dung et al. as the primary of domestic energy,
accounted for 40% of rural household energy[7]. Indoor air pollution (IAP) from burning wood, dung et al. is a
major cause of acute respiratory infections (ARI), which constitute the most important cause of death of young
children in developing countries [9]. Through its effect on respiratory infections, IAP is estimated to cause between