The purpose of this study was to investigate emissions during storage of solid wood fuels by measuring both the emission of monoterpenes and the formation of aldehydes during storage of undried sawdust, dried sawdust, and pellets. Sawdust is commonly stored up to several months at pellet plants. Pellets are stored due to seasonal demand variation and wood fuel trade. Freshly sawn sawdust from Scots pine (Pinus sylvestris) was dried and pelleted. The fuel was stored in a controlled laboratory setting to avoid undue influence of temperature and humidity fluctuations. The emission of volatiles was analyzed with static headspace and gas chromatography–mass spectroscopy. The content of terpenes in undried sawdust decreased dramatically in the first days of storage, with 10 percent of the original amount left after 10 days. In dried sawdust, about two-thirds of the terpenes that remained after drying were released in the first 10 days. In sawdust, the hexanal concentration was negligible at first, became equal to the terpene concentration after 15 days, and reached a maximum after 40 to 50 days. Hexanal was then found in an equal amount to the remaining terpene content in undried sawdust; in dried sawdust, it was found in a much higher amount than the remaining terpene content. In pellets, hexanal content was consistently higher than the terpene content. The wood fuels were low-emitting for both terpenes and hexanal after 2 to 3 months. In conclusion, although terpenes have been assumed to be the predominant volatiles emitted during storage of solid wood fuels, hexanal from fatty acid oxidation is also of importance.