Barcelona faces the challenge to make its smart city truly smart

Just about every major city wants to be called a smart city, it seems.

Take one example: Barcelona made a big splash to be considered a smart city three years ago. Since then, it has installed noise and air quality sensors along a major thoroughfare. There are also smart streetlights, smart parking and even smartphone apps for tourists to use to navigate the city's sights.

At the city's Llevant Beach, there are 22 self-powered lighting units, including six that rely on solar and wind power. The wind-powered units can function when wind speed is relatively slow, storing up enough energy to operate as long as six days without pulling electricity from the grid.

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