(3) - Williams, Heathcote, Autogeddon - Page 124, Arcade Publishing, Newyork, 1991 , isbn 1-55970-176-5 - Referencing Hillary French, Clearing The Air,: A Global Agenda, Washington: Worldwatch Institute, Jan 1990

T. N. Skoulikidis, a Greek specialist on acid corrosion, has estimated that Athenian monuments have deteriorated more in the past 20-25 years from pollution than in the past 2,400.