Measurements of atmospheric volatile organic compounds were performed in the Finnish Boreal forest atmosphere during spring 2003, as part of the project QUEST It would be, to our knowledge, the first time DMA, TMA, MTOP and Cis-3-hexenyl Acetate are measured with this method. A compound with mass 68 amu, which could be Isoprene has also been identified. Most compounds show a clear diurnal varia...