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Where caretakers once worried about smoke blackening the Tower, they are now concerned that the cleaner pollution may yellow the stonework.
Air pollution controls may affect the Tower of London
Submitted by Milica on Sat, 2007/06/23 - 02:31.
1101 CE to 1200 CE | English | General Science | Modern Society | Stonework
Science Daily reports that the Tower of London may soon be affected by changes in air pollution regulations that have decreased the amount of sulfur dioxide in the air. The sulfur keeps organisms from growing and darkening the Tower's stonework.
