http://www.legislation.gov.uk/wsi/2002/3160/introduction/madeThe Smoke Control Areas (Authorised Fuels) (Amendment) (Wales) Regulations 2002SmokeKing's Printer of Acts of Parliament2017-11-14CLEAN AIR, WALES Section 20 of the Clean Air Act 1993 provides that where smoke is emitted from a chimney in a smoke control area and that chimney is either—a chimney of a building; ora chimney serving the furnace of a fixed boiler or industrial plan (not being a chimney of a building) 2002 No. 3160 (W.295) Made 17th December 2002 Coming into force 31st December 2002 The National Assembly for Wales, in exercise of the powers conferred upon the Secretary of State by sections 20(6) and 63(1) of the Clean Air Act 1993, and now exercisable by the National Assembly for Wales, hereby makes the following Regulations: 1993 c. 11. The powers of the Secretary of State, insofar as exercisable in relation to Wales, have been transferred to the National Assembly for Wales; see Article 2 of and Schedule 1 to the National Assembly for Wales (Transfer of Functions) Order 1999 (S.I. 1999/672).