http://www.legislation.gov.uk/ukpga/Eliz2/4-5/52/section/23Clean Air Act 1956 (repealed 27.8.1993)An Act to make provision for abating the pollution of the air.1979-08-31texttext/xmlenStatute Law Database2011-05-261993-08-27 Clean Air Council23F2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .