On February 10–11, within the international education project Erasmus+, University hosted guests from Lithuania, namely researchers from Kaunas University of Technology. The event was organized by the Department of Ecology and Sustainable Environmental Management (ISD). A number of thematic lectures were held by foreign guests for the Polytechnicians at the Renewable Energy Laboratory of the ESEM Department. Professor Gintaras Denafas told about the experience and challenges of the Lithuanian waste management system. From Violeta Kaunelienė the audience learned about indoor air quality and how it can be affected. Dr. Linas Puodžiukynas gave a lecture on indoor air purification technologies.