Clear skies help protect St Paul's
The risk of chemical erosion to the stone facade of St Paul's Cathedral is at a 300-year low.
A recent study has found that the levels of sulphur dioxide - found in acid rain - have fallen by 95% over 30 years.
The drop is largely down to a decline in industry in central London and a move towards cleaner energy production, according to the report by the universities of Portsmouth, Oxford, Sussex and Cambridge.
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New Dartford crossing could cost £5billion
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