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This paper shows the investigation of a living wall system inside a classroom. Humidity, temperature and the CO 2 -concentration were measured in two classrooms with the same volume. One of the classrooms is equipped with a living wall system. Air temperature and relative air humidity were investigated for 10 months including summer and winter months. In winter the increased relative air humidity of the greened classroom improved the comfort level. In summer mould spores were also investigated in the classrooms and outdoor. Spores from Cladosporium , Penicillium , Aspergillus versicolor , Alternaria and other were found, but the concentration of the mould spores in the greened classroom was below the mould spores concentration in the not greened classroom or outside. The volume of the mass of the plants is about 1 % of the classrooḿs volume. But still a small CO 2 -reduction because of the plants was measured. [ABSTRACT FROM AUTHOR]