MILAN, Italy, Nov. 23 (UPI) -- Efforts to protect Leonardo Da Vinci's "Last Supper" from air pollution appear to be succeeding, University of Southern California researchers said.
The refectory of Santa Maria Delle Grazie Church in Milan installed a sophisticated heating, ventilation and air conditioning system in 2009 to protect the painting from the polluted air of Milan. Italian officials hired Constantinos Sioutas, a professor of civil and environmental engineering at the USC Viterbi School of Engineering, to test the effectiveness of the protection efforts.