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, prescribes certain devices as anti-pollution devices, requires certain motor vehicles to be fitted with specified anti-pollution devices, and prescribes the form of labels that may be affixed to defective motor vehicles by authorised officers. The Regulation amends the Protection of the Environment Operations (Penalty Notices) Regulation 1999 to enable penalty notices to be issued for the offences referred to in Part 3 of the Regulation.