<Tr> <Td_colspan="2"> Introduced a number of measures to reduce air pollution, especially by introducing' smoke control areas' in some towns and cities in which only smokeless fuels could be burned </Td> </Tr> <Tr> <Td_colspan="2"> Status: Repealed </Td> </Tr> <P> The Clean Air Act 1956 was an Act of the Parliament of the United Kingdom passed in response to London's Great Smog of 1952 . It was in effect until 1964, and sponsored by the Ministry of Housing and Local Government in England and the Department of Health for Scotland . </P> <P> The Act introduced a number of measures to reduce air pollution, especially by introducing "smoke control areas" in some towns and cities in which only smokeless fuels could be burned . By shifting homes' sources of heat towards cleaner coals, electricity, and gas, it reduced the amount of smoke pollution and sulphur dioxide from household fires . Reinforcing these changes, the Act also included measures to relocate power stations away from cities, and for the height of some chimneys to be increased . </P>

When was the clean air act passed in the uk