December 4, 1952: A thick, heavy smog begins to smother London and persists for the next four days. By December 7, there was virtually no sunlight and visibility was reduced to five yards. After a collision between two trains occured, all transporation was halted in the region. It is believed that approximately 4,000 people were killed and over 100,000 were made ill from smog’s effects to their respiratory systems. It is known to be the worst air-pollution event in the history of the United Kingdom.
Photo: Piccadilly Circus, London 1952 (Central Press)