In Pictures: The Great Smog of 1952
Facelift for city

While the air has cleared, the effect of past smogs can still be glimpsed today. With its landmarks cloaked in soot, London's contrast of light and dark has long had a chiaroscuro beauty - until the clean-up crews revealed white and cream stone under the grime. Hence St Paul's two-tone walls during its restoration - blackened below, while the cleaned upper levels gleam in the sunlight.

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