15/01/2026
This is something I mention on the tour as we go along - the clean air act and how most of London was completely black with soot for centuries, until open coal and wood fires were outlawed in the 1950s after smog pollution affected hundreds of thousands of people terminally, and the government finally said enough was enough.
After this, the big clean up began, and here is some newly released BBC footage from that era showing St. Paul's Cathedral undergoing its first ever big clean up which removed INCHES thick build-up of black soot which had been accumulating since the moment it was built.
Unfortunately continued pollution from vehicles meant it had to be cleaned again in the 1970s, but since gradually tightening congestion efforts since then, London has become cleaner and cleaner over the years, and now the cleaned buildings are mostly staying that way.
But look up, and occasionally you can still spot the odd blackened building which never got cleaned since the 1950s clean air act, and they still show evidence of the city's past.
"Even the man who built it, Sir Christopher Wren, never saw it looking quite so s***k and span."By the time it was finished in 1710, St Paul's Cathedral was ...