The focus is on ways to improve air quality. This includes facade greening with ivy, infrastructure for e-mobility and car sharing, advertising pillars with algae filters and so called city trees overgrown with moss. This model and other lesson-related examples can be found on the website of the Erasmus + project make in class: https://www.makeinclass.eu or the website of the Gymnasium Neubiberg https://www.gymnasium-neubiberg.de