Woody biomass is considered renewable resources forconversion into bioenergy.Lab-scale tests were conducted using Western Red Cedar(WRC)and Douglas fir(DF)residues under controlled environment conditions(aerobic versus non-aerobic,and different temperatures)to study the gas emissions and dry matter loss from high-moisture biomass during storage.Results showed that the variation of COemissions with temperature differed with the type of materials(WRC versus DF,and wood chips versus greens).Aerobic conditions led to higher COand VOC emissions than non-aerobic conditions over the same storage period.Microbial analysis results were compatible with the COemission results for all of the materials investigated.