• The deadly 1952 event is thought to have caused more than 12,000 deaths
• It’s known that coal burning was to blame, but processes were a mystery
• Study has now found that sulfuric acid particles mixed with natural fog
• This diluted the particles and created an acidic haze that covered the city

In 1952, a mysterious fog swept through London, blanketing the city in a dense layer of pollutants that killed thousands of people and animals and made it difficult to breathe for days.

While the exact cause has long remained unknown, an international team of researchers now says its solved the mystery – and the same air chemistry can be seen today in China and other areas. […]

Source: Mystery of London’s killer fog in 1952 revealed in new analysis | Daily Mail Online