Air pollution 'harmful to Alhambra Palace'

Researchers say that although it has very little industry, Granada's air pollution levels are similar to those of much larger cities such as Madrid, especially because of the constant flow of traffic.

And although the Alhambra is set on a hill outside the main hub, it is already showing subtle signs of being affected, investigators say.

Vehicle pollution is not the only problem – currents of Saharan wind are also taking their toll on the Palace, the university team alerts.

Winds coming from the south bringing desert sand are not uncommon on Spain's east coast, but the Sierra Nevada mountain range acts as a buffer and 'contains' the Saharan air over the city.

The scientists have urged Granada's heritage department to keep a close eye on pollution damage to the Palace, and local planning and transport authorities to find ways to cut the traffic in the city.