"dust composed of smoke and fog particles accumulated before the Clean Air Acts"

Nelson's Column during the Great Smog of 1952
Creative Commons Attribution Share AlikeNelson's Column during the Great Smog of 1952 - Credit: N T Stobbs
In 1956 and 1968 the UK Government passed laws known as the Clean Air Acts. These laws came into effect in response to the severe air pollution in and around cities such as London, caused by emissions from domestic coal fires and industrial coal furnaces. The Acts introduced ‘smoke-control areas’ where only smokeless fuels could be burned. The laws were prompted, in particular, by the Great London Smog of 1952, which caused thousands of respiratory-related illnesses and deaths. In 1993 a further Clean Air Act was passed by the UK Government.