... December 4, 195 2, and lasted until March of 195 3. It was a great disaster that killed thousands and formed an important impetus to the modern environmental movement. In early December of 195 2, a ... and industrial emissions. Cities are often centers of these types of activities, and many suffer from the effects of smog, especially during the warm months of the year.The Great London Smog ... for almost 48 hours from the morning of 6 December. Officials believe that as many as 12,000 people may have died in the great London smog of 195 2. Many of those killed were elderly people or...