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Italian architectural firm, Nemesi & Partners, has revealed its award winning plans to clad Palazzo Italia in Milan with a smog-filtering facade as part of the Milan Expo 2015. The unique pavilion will be made from a special air-purifying cement created by Italcementi and will stretch over 9,000 square meters (96, 875 sq ft), requiring an estimated 2,000 tonnes (2,204 tons) of cement to accomplish the feat.

"The entire outdoor surface and part of the interiors will consist of i.active Biodynamic cement panels," says Italcementi. "In direct sunlight, the active principle contained in the material 'captures' certain pollutants present in the air and converts them into inert salts, helping to purify the atmosphere from smog."

Some 80 percent of this air-purifying cement is made from recycled materials, such as scraps from Carrara marble. The Palazzo Italia will also be fitted with a photovoltaic glass rooftop to generate solar energy during the day.