50th Anniversary of the Great SmogThis year marks the anniversary of the 1952 London smog, which caused thousands of deaths and triggered decisive action to tackle air pollution in the UK. The 50th Anniversary is a good time to reflect on the improvements made to our local environment and the picture below illustrates what the air quality was like during the Great Smog of London.The smog of 1952 caused thousands of deaths and triggered decisive action to tackle air pollution in the UK.