During the project in total 13 samples of pellets, 9 samples of wood logs and 9 samples of briquettes were examined. The samples were gathered from local producers and resellers in Latvia and as well received from the Finnish and Estonian partners. Physical parameters were determined for various types of biomass, such as, wood, straw, peat and grass. Combustion tests with 25 kW pellet boiler and 9 kW stove were performed at the Laboratory of Environmental Monitoring of the IESE. The testing was done using the previously gathered samples of biofuel. The aim of the testing was to reveal the relationship between the emission rates, the efficiency and capacity of the appliances and the quality of the biofuels.