This Regulation implements the Protection of the Environment Operations Act 1997 and replaces Clean Air (Domestic Solid Fuel Heaters) Regulation 1997 and the Clean Air (Motor Vehicles and Motor Vehicle Fuels) Regulation 1997. Part 2 prohibits heaters from being sold unless they are marked in accordance with a specified Standard and there is a relevant certificate of compliance in force. Part 3 specifies what is to be taken to be the emission of excessive air impurities from a motor vehicle, pres