Sofia traditionally celebrates European Mobility Week. In 2023, the slogan of the campaign is: "Save energy". The aim is to promote the use of public transport, active mobility, the reduction of car dependence and the development of transport infrastructure for a just green transition.

On 22 September, in Europe's traditional Car-Free Day, part of the European Mobility Week campaign, we presented the AeroSolfd project, which develops new solutions for retrofitting confined spaces for cleaner air. Sofia is actively involved in the Aerosolfd project. A stop from the Sofia metro was selected to test innovative air purifiers, which are being developed within the project. The results of the operation of air filtration devices and the effect on dust pollution measurements from brake systems will be an important element of the development and rapid implementation of affordable solutions for retrofitting the urban environment.

AeroSolfd is co-funded by the European Union under Horizon Europe.

The project is funded under HORIZON Innovation Actions.