Lecture Effect of filter type in ventilation systems on NO2 concentrations in classrooms Yang, Aileen; Nikolaisen, Kristian Fredrik; Holøs, Sverre Bjørn; Thunshelle, Kari; Dauge, Franck René; Mysen, Mads Publication details Event: Cold Climate 2018 (Kiruna) Date: March 12th 2018 – March 15th 2018