EMT Madrid, Europe's second-largest municipal bus operator, achieved a significant milestone by completing the elimination of all diesel buses from its fleet by the end of 2022.

When the company was created in 1947, the buses were also blue, but in a darker shade than the current one, a legacy of the old Sociedad Madrileña de Tranvías.

And so it was until 1992, when the first sky blue bus arrived, when Gas Natural buses began to enter the company, and these had their characteristic colour to define them from the rest.

[10] As part of EMT's added value there is an open data system for the "Smart City", CCTV and free WiFi connection both in the most relevant stops and in the whole bus fleet.

[11] To reduce the volume of polluting gases emitted by its vehicles through the use of alternative energies such as compressed natural gas, biodiesel, electric traction, hydrogen, bioethanol; intensive renewal of the fleet with conventional diesel buses with strict environmental requirements.