The construction of the Temple Expiatori de la Sagrada Família began in 1882 and remains ongoing, with a projected completion date in 2026. This landmark is a prime example of Catalan Modernisme, attracting over three million visitors each year. Recent advances in digital design and construction have been embraced, using software like Rhinoceros and 3-D printing to visualize and expedite the project, along with a digitally rendered video that illustrates its anticipated appearance upon completion.

The cause of this air pollution is Barcelona's abundance of cars, it's streets aren't very friendly to pedestrians, as a majority of its roadways are specifically designed for cars. To deal with this problem, the city created an extensive urban mobility plan to reduce traffic. The most interesting part of this urban planning initiative, was the Superillas, which translates to superblocks in English.